JP4182737B2 - Navigation system and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a navigation system and a program.
[0002]
[Prior art]
Conventionally, in a navigation device, for example, a current position of a vehicle, that is, a current position, is detected by GPS (Global Positioning System), and a rotation angular velocity of a vehicle detected by a gyro sensor, that is, based on a turning angle, The direction of the vehicle, that is, the vehicle direction is detected, map data is read from the data recording unit, a map screen is formed on the display unit, and the current location, a map around the current location, and the vehicle direction are displayed on the map screen. It is displayed. Therefore, the driver who is an operator can drive the vehicle according to the current location displayed on the map screen, the map around the current location, and the direction of the vehicle.
[0003]
Further, when the driver inputs a destination and sets search conditions, a route from the departure point to the destination represented by the current location is searched based on the search conditions. The searched route, that is, the searched route is displayed together with the current location and the destination on the searched route display screen formed on the display unit. Therefore, the driver can drive the vehicle according to the displayed search route. When the driver inputs a departure point different from the current location, a route from the input departure point to the destination is searched.
[0004]
However, if the driver is not guided to the geography of the vicinity of the destination, the driver cannot imagine the position of the destination and feels anxiety while driving the vehicle.
[0005]
Thus, a navigation device is provided in which a point that is easy to understand for the driver is extracted, the extracted point is set as a destination or a passing point, and a route is guided (for example, see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-14920
[Problems to be solved by the invention]
However, in the conventional navigation device, since the guidance of the searched route is always performed while the vehicle is traveling along the searched route from the current location or the starting point to the destination, the driver always considers the guidance. It must be.
[0008]
An object of the present invention is to provide a navigation system and a program that can solve the problems of the conventional navigation device and can make a vehicle travel comfortably from a current location or a departure location to a destination.
[0009]
[Means for Solving the Problems]
Therefore, in the navigation system of the present invention, the navigation information acquisition processing means for acquiring the navigation information, the destination setting processing means for setting the destination, and the set destination based on the navigation information. The prominent property setting processing means for setting a conspicuous property, the specific section search processing means for searching for a route from the set conspicuous property to the destination, and the positional relationship between the current location and the searched route while the vehicle is traveling A detailed guidance start condition establishment determination processing means for determining whether or not a detailed guidance start condition is satisfied, and a detailed guidance processing means for guiding a route from the current location to the destination when the detailed guidance start condition is satisfied, Have
The detailed guidance start condition establishment determination processing means determines that the detailed guidance start condition is established when the distance from the current location to the conspicuous property is shorter than the distance from the conspicuous property to the destination.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
FIG. 1 is a functional block diagram of the navigation system according to the first embodiment of the present invention.
[0020]
In the figure, 91 is a navigation information acquisition processing means for acquiring navigation information, 92 is a destination setting processing means for setting a destination, 93 is a conspicuous property corresponding to the set destination based on the navigation information. A conspicuous property setting processing means to be set, 94 is a specific section search processing means for searching for a route from the set conspicuous property to the destination, and 96 is based on the positional relationship between the current location and the searched route while the vehicle is traveling. , Detailed guidance start condition establishment judgment processing means for judging whether or not the detailed guidance start condition is established, and 97 is detailed guidance processing means for guiding a route from the current location to the destination when the detailed guidance start condition is established. .
[0021]
FIG. 2 is a diagram showing the navigation system according to the first embodiment of the present invention.
[0022]
In the figure, reference numeral 14 denotes an information terminal, for example, a navigation device as an in-vehicle device mounted on a vehicle. The navigation device 14 includes a GPS sensor 15 as a current location detection unit for detecting the current location, map data, road data, It functions as a computer based on basic information of the navigation device 14 such as search data, that is, a data recording unit 16 as an information recording unit in which navigation information is recorded, various programs, data, and the like. Based on the navigation processing unit 17 that performs various arithmetic processes such as navigation processing, the azimuth sensor 18 as an azimuth detection unit that detects the direction of the vehicle, and a driver who is an operator performs predetermined inputs. The operation unit 34 serving as a first input unit of the image display device, and various types of images displayed on a screen (not shown) A display unit 35 as a first output unit for displaying and notifying the driver, a voice input unit 36 as a second input unit for performing predetermined input by voice, and various displays by voice A voice output unit 37 as a second output unit for notifying the driver, and a communication unit 38 as a transmission / reception unit functioning as a communication terminal. The navigation processing unit 17 includes an operation unit 34, a display unit 35, An audio input unit 36, an audio output unit 37, and a communication unit 38 are connected. The navigation processor 17 is also connected with a vehicle speed sensor 41 as a vehicle speed detector.
[0023]
The GPS sensor 15 detects the current location on the earth by receiving radio waves generated by an artificial satellite, and also detects the time.
[0024]
Note that a distance sensor, a steering sensor, an altimeter, or the like can be used alone or in combination as the current location detection unit instead of the GPS sensor 15. The distance sensor detects a distance between predetermined points on the road, and calculates a distance based on a rotational speed of a wheel (not shown) or by integrating acceleration twice. The steering sensor detects a rudder angle, for example, an optical rotation sensor attached to a rotating part of a steering wheel (not shown), a rotation resistance sensor, an angle sensor attached to a wheel, etc. Can be used.
[0025]
A gyro sensor, a geomagnetic sensor, or the like can be used as the direction sensor 18. As the gyro sensor, for example, a gas rate gyro, a vibration gyro, or the like is used, and the vehicle direction is detected by integrating the turning angle. The geomagnetic sensor detects the direction of the vehicle by measuring geomagnetism.
[0026]
The data recording unit 16 includes a database including data files such as a map data file, an intersection data file, a node data file, a road data file, a search data file, and a facility information data file. Each data file includes a display unit. Data for outputting various images is recorded in 35. The data recording unit 16 also records data for outputting predetermined information by the audio output unit 37.
[0027]
For example, the map data file contains map data for displaying a map, the intersection data file contains intersection data related to each intersection, the node data file contains node data related to node points, and the road data file contains road data related to roads. The search data file stores search data for searching for a route, and the facility information data file stores facility information data related to various facilities. The intersection data, node data, road data, search data, etc. Road condition data representing the road condition is constructed. The node data includes data indicating actual road branch points (including intersections, T-junctions, etc.), node points, and inter-node point links that connect the node points.
[0028]
And, according to the road data, the width of the road itself, the slope (gradient), the cant, the bank, the road surface state, the number of lanes of the road, the location where the number of lanes decreases, the location where the width becomes narrow, etc. Radius of curvature, intersection, T-junction, corner entrance, etc., road attributes, downhill roads, uphill roads, etc., road types, national roads, prefectural roads, narrow streets, and other highways, urban highways Expresses highways and toll roads such as toll roads. Further, the road data represents a railroad crossing, a highway entrance and exit road (rampway), a highway / toll road tollgate, and the like.
[0029]
The facility information data represents facility information of facilities such as hotels, gas stations, parking lots, sightseeing spots, department stores, etc. in each region.
[0030]
The navigation processing unit 17 includes an arithmetic device that controls the entire navigation device 14 and a CPU 31 as a control device, and a DRAM as a first recording medium used as a working memory when the CPU 31 performs various arithmetic processes. In addition to RAM 32 such as SRAM, MRAM, and FeRAM, and a control program, a ROM 33 is provided as a second recording medium on which various programs for searching for a route to a destination, route guidance, and the like are recorded. .
[0031]
A semiconductor memory, a magnetic core, or the like is used as an internal storage device such as the RAM 32 and the ROM 33. In addition to the RAM 32, the ROM 33, and the like, a flash memory (not shown) as a third recording medium can be disposed in the navigation processing unit 17. An MPU or the like can be used instead of the CPU 31 as the arithmetic device and the control device.
[0032]
The data recording unit 16 includes a magnetic disk such as a hard disk (not shown) or a flexible disk as a fourth recording medium arranged as an external storage device for recording the various data. A head such as a read / write head (not shown) for reading and writing the data is provided. Similarly, the data recording unit 16 includes a magnetic tape, a magnetic drum, a CD, an MD, a DVD, an optical disk, an MO, an IC card, an optical card, and the like as a fifth recording medium disposed as an external storage device. You can also
[0033]
Various programs can be recorded in the ROM 33 and various data can be recorded in the data recording unit 16, but the programs, data, and the like can also be recorded in an external storage device such as a hard disk. In this case, for example, the navigation memory 17 can be provided with the flash memory, and the program, data, etc. can be read from the hard disk or the like and written to the flash memory. Therefore, the program, data, etc. can be updated by exchanging the hard disk or the like. Further, when an automatic transmission control device is mounted to control an automatic transmission (not shown) mounted on the vehicle, the control program, data, etc. for the automatic transmission control device are also stored in the hard disk or the like. Can be recorded. Further, the program, data, etc. can be received via the communication unit 38 and written to the flash memory.
[0034]
The operation unit 34 is operated by the driver to correct the current location at the start of traveling, input a departure point and destination, input a passing point, and operate the communication unit 38. A keyboard, a mouse, a barcode reader, a light pen, a remote control device for remote control, a joystick, etc., which are arranged independently of the display unit 35, can be used. Further, as the operation unit 34, a predetermined input operation is performed by touching or clicking an image operation unit such as various keys, switches, and buttons displayed as images on the screen formed in the display unit 35. Can do.
[0035]
As the display unit 35, a display such as a CRT display, a liquid crystal display, or a plasma display can be used, or a hologram device that projects a hologram on a windshield of a vehicle can be used. And on the screen formed in the display unit 35, the current location, map, search route, guidance information along the search route, traffic information, etc. are displayed, characteristic photographs at the intersection or the search route, frame diagrams, etc. In addition to displaying the distance to the next intersection and the direction of travel at the next intersection, the operation guidance, operation menu, and key guidance for the image operation unit, operation unit 34, voice input unit 36, etc. are displayed. Or FM multiplex broadcast programs or the like can be displayed.
[0036]
The voice input unit 36 includes a microphone (not shown) and the like, and can input necessary information by voice. Further, the voice output unit 37 includes a voice synthesizer and a speaker (not shown), and the search route, guidance information, traffic information, and the like are output from the voice output unit 37, for example, as voice synthesized by the voice synthesizer. . In addition to the voice synthesized by the voice synthesizer, various sounds, various guidance information recorded in advance on a tape, a memory, and the like can be output.
[0037]
The communication unit 38 is arranged along the road with various types of information transmitted from a road traffic information center such as a VICS (registered trademark: Vehicle Information and Communication System) center as a first information provider. A beacon receiver for receiving a radio wave beacon, an optical beacon, etc. via a radio beacon device, an optical beacon device, etc., an FM receiver for receiving FM multiplex broadcast via an FM broadcast station, and the like are provided. And, the beacon receiver receives traffic information such as traffic jam information, regulation information, parking lot information, traffic accident information, service area congestion status information, etc. In addition to the traffic information, news, General information such as weather forecasts can be received as FM multiplexed information. The beacon receiver and the FM receiver are unitized and arranged as a VICS receiver, but can be arranged separately.
[0038]
The communication unit 38 can also receive various data such as D-GPS information for detecting a detection error of the GPS sensor 15 transmitted from a predetermined base station. Further, the communication unit 38 can receive position information by radio wave beacons, optical beacons, and the like to detect the current location. In this case, the beacon receiver functions as a current location detection unit.
[0039]
Furthermore, the communication part 38 can also receive various information such as traffic information and general information from the information center 51 as the second information provider. For this purpose, the communication unit 38 and the information center 51 are connected via a network 43.
[0040]
The navigation device 14, the information center 51, the network 43, etc. constitute a navigation system, and various types of information are transmitted and received between the communication unit 38 and a communication unit (not shown) of the information center 51.
[0041]
In the present embodiment, in order for the communication unit 38 to function as a communication terminal, a communication device is integrally provided in the communication unit 38. However, a communication device is provided separately from the communication unit 38. It is also possible to connect the communication device and the communication unit 38. In that case, as a communication device, a mobile phone such as a mobile phone, a car phone, or a PHS, a wireless LAN card, or the like is used, a personal computer, a portable computer, a personal digital assistant (PDA), an electronic notebook, or a video phone. A game machine or the like having a communication function can be used.
[0042]
The network 43 includes a LAN (Local Area Network), a WAN (Wide Area Network), an intranet, a cellular phone line network, a telephone line network, a public communication line network, a dedicated communication line network, a communication line network such as the Internet, etc. The communication means can be used. Communication means using CS broadcasting, BS broadcasting, terrestrial digital television broadcasting, FM multiplex broadcasting, etc. by a broadcasting satellite can also be used. Furthermore, it is possible to use communication means such as a non-stop automatic toll payment system (ETC) and a boundary communication system (DSRC) that are used in an intelligent road traffic system (ITS).
[0043]
The information center 51 may be operated by any one of an individual, a company, an organization, a local government, a government-related organization, or the like, and may be operated by the VICS (registered trademark) center.
[0044]
The information center 51 includes a server 53, the communication unit, and the like. The server 53 performs two-way communication between the information center 51 and the navigation device 14, and provides traffic information, general information, and the like. Is called. For this purpose, the server 53 includes a CPU 54, a RAM 55, a ROM 56, and the like as an arithmetic device and a control device, and functions as a computer based on predetermined programs, data, and the like. The server 53 and the navigation processing unit 17 can also constitute a computer.
[0045]
Further, a database (DB) 57 as an information recording unit is connected to the server 53, and the same data as various data (including navigation information) recorded in the data recording unit 16 is included in the database 57. Can be recorded.
[0046]
Then, the CPU 54 receives traffic information, general information, etc. transmitted from the VICS (registered trademark) center, etc., and records it in the database 57 as primary information, or processes the primary information to perform statistical processing, Statistical data constituting history information indicating the history of the traffic jam status, traffic jam prediction information for predicting the traffic jam status, and the like are created, and the statistical data is recorded in the database 57 as secondary information. In the present embodiment, in creating the statistical data, the history information includes detailed conditions such as date and time, day of the week, weather, various events, seasons, facility information (whether a large facility such as a department store or a supermarket). Added.
[0047]
Next, the basic operation of the navigation system having the above configuration will be described.
[0048]
First, when the operation unit 34 is operated by the driver and the navigation device 14 is activated, a navigation initialization processing unit (not shown) of the CPU 31 performs navigation initialization processing, and the current location and direction detected by the GPS sensor 15. While reading the direction of the vehicle detected by the sensor 18, various data are initialized. Note that the matching processing means (not shown) of the CPU 31 performs matching processing, and the current location is on any road link based on the trajectory of the read current location and the shape and arrangement of each road link constituting the surrounding road. The current location is specified by determining whether the current location is located.
[0049]
Subsequently, the navigation information acquisition processing unit 91 (FIG. 1) as the first information acquisition processing unit of the CPU 31 performs the navigation information acquisition processing as the first information acquisition processing, and the navigation information is stored in the data recording unit 16. Or received from the information center 51 via the communication unit 38 and acquired. When acquiring from the information center 51, the navigation information acquisition processing unit 91 downloads the received navigation information to a flash memory, a hard disk or the like. In addition, when the navigation information is acquired via the communication unit 38, the program can also be acquired.
[0050]
A display processing means (not shown) of the CPU 31 performs display processing, forms a map screen on the display unit 35, and displays the current location, a map around the current location, and the vehicle direction on the map screen. Accordingly, the driver can drive the vehicle according to the current location, the map around the current location, and the direction of the vehicle.
[0051]
Further, the navigation device 14 or the navigation system can be used to search for a route. In this case, when the driver operates the operation unit 34 to input a destination, the destination setting processing unit 92 of the CPU 31 performs a destination setting process to set the destination. Note that the departure place can be input and set as necessary. When the destination is set, the route search processing means (not shown) of the CPU 31 or the CPU 54 performs route search processing, reads the current location, the destination, etc., reads the search data from the data recording unit 16, and the current location. Based on the destination and the search data, a route from the starting point represented by the current location to the destination is searched, and route data representing the searched route is output.
[0052]
In addition, a guidance processing means (not shown) of the CPU 31 performs guidance processing to guide the driver on the searched route. For this purpose, the guidance processing means sends a guidance command to the display processing means, and the display processing means reads the route data in accordance with the guidance command and displays the searched route on the map screen in accordance with the route data.
[0053]
When the route search process is performed in the information center 51, the transmission processing unit (not shown) of the CPU 54 performs the transmission process, transmits the route data representing the searched route to the navigation device 14, and obtains the second information of the CPU 31. Route information acquisition processing means (not shown) as processing means performs route information acquisition processing as second information acquisition processing, and receives and acquires the route data. Subsequently, the guidance processing means sends a guidance command to the display processing means, and the display processing means reads the route data in accordance with the guidance command and displays the searched route on the map screen according to the route data.
[0054]
The guidance processing means sends a guidance command to a voice output processing means (not shown) of the CPU 31, and the voice output processing means performs voice output processing according to the guidance command, and outputs the search route from the voice output unit 37 by voice.
[0055]
In this way, the search route is guided, and the driver can drive the vehicle according to the guided search route.
[0056]
The navigation device 14 can receive traffic information, general information, and the like via the communication unit 38. For this purpose, additional information acquisition processing means (not shown) as third information acquisition processing means of the CPU 31 performs additional information acquisition processing as third information acquisition processing, and receives the traffic information, general information, etc. as additional information. And get. Therefore, the display processing means displays traffic information, general information, etc. on the map screen.
[0057]
The traffic information specifies information type data indicating the type of information, secondary mesh X and Y data for specifying a secondary mesh as a mesh, and a road link connecting two points (for example, intersections). And link number data representing the uplink / downlink and link information representing the content of information provided corresponding to the link number data. The link information includes, for example, a traffic jam from the start point of the road link. Consists of traffic jam head data representing the distance to the head, traffic jam degree data representing the degree of traffic jam, traffic jam length data representing the traffic jam section from the head of the traffic jam to the tail of the traffic jam, and the like.
[0058]
Therefore, the display processing means converts each link information in the traffic information into, for example, a traffic congestion arrow as a traffic condition index indicating a traffic congestion index indicating whether the traffic is congested or not. A traffic jam arrow is displayed along the road on the map screen. In this case, the color of the road, the traffic jam arrow, etc. is changed to red, orange, etc. according to the degree of traffic jam.
[0059]
In this way, the driver can know the traffic jam situation on the road, the search route, etc. on which the vehicle is to travel.
[0060]
By the way, as described above, when the route search process is performed, the search route from the departure point to the destination is displayed on the map screen, but when the driver is not guided to the geography near the destination, You cannot imagine the location of your destination, and you feel uneasy while driving the vehicle.
[0061]
Therefore, in the present embodiment, the normal search mode and the simple search mode can be set as the search route guidance mode, and the driver selects the simple search mode in the initial menu, for example. Then, a predetermined facility whose place is understood by the driver is searched, the searched facility is set as a conspicuous property, and a route from the conspicuous property to the destination is guided. Further, route guidance is not performed while the vehicle is running from the departure place to a conspicuous property.
[0062]
Next, the operation of the navigation system when the simple search mode is selected will be described.
[0063]
FIG. 3 is a main flowchart showing the operation of the navigation system according to the first embodiment of the present invention.
[0064]
First, when the operation unit 34 (FIG. 2) is operated by the driver and the navigation device 14 is activated, the current position is detected by the GPS sensor 15 and the vehicle direction is detected by the direction sensor 18, and then the navigation initialization is performed. The processing means performs navigation initialization processing, reads the current location and the vehicle direction, and initializes various data.
[0065]
Next, the navigation information acquisition processing unit 91 (FIG. 1) reads and acquires navigation information from the data recording unit 16, and the display processing unit forms a map screen on the display unit 35, and the map screen In addition, the current location, a map around the current location, and the vehicle direction are displayed.
[0066]
When the driver selects the simple search mode using the initial menu or the like, the mode setting processing means (not shown) of the CPU 31 performs mode setting processing to set the simple search mode. Subsequently, when the driver tries to acquire a search route to a predetermined destination and operates the operation unit 34 and clicks (or touches) a predetermined destination setting key, the display processing means is displayed on the display unit 35. A setting screen is formed, and a message such as “Enter destination” is displayed on the setting screen. Therefore, when the driver inputs a destination, the destination setting processing means 92 sets a predetermined point as the destination.
[0067]
Subsequently, the conspicuous property setting processing means 93 of the CPU 31 performs a conspicuous property setting process, and sets a conspicuous property corresponding to the set destination based on the navigation information. In the conspicuous property setting process, when a conspicuous property is not set, a route from the departure place to the destination is searched, and the searched route is guided.
[0068]
For this purpose, the route search processing means of the CPU 31 performs route search processing, based on the current location, destination and search data, and according to a predetermined search condition, from the departure point represented by the current location to the destination. A route is searched and route data representing the searched route is output.
[0069]
And the said guidance process means of CPU31 performs a guidance process, and guides the search route from a departure place to the destination to a driver | operator. For this purpose, the guidance processing means sends a guidance command to the display processing means, and the display processing means reads the route data in accordance with the guidance command and displays the searched route on the map screen in accordance with the route data.
[0070]
On the other hand, when a conspicuous property is set in the conspicuous property setting process, the specific section search processing means 94 of the CPU 31 performs a specific section search process, reads the conspicuous property, destination, and search data, and stores the search data in the search data. Based on the conspicuous property to the destination, the route of the specific section is searched and the route data is output. The route data is recorded in the RAM 32.
[0071]
Subsequently, when the vehicle travels toward the conspicuous property, the arrival determination processing unit (not shown) of the CPU 31 performs the arrival determination processing, determines whether the vehicle has reached the conspicuous property, and the vehicle is conspicuous. When the property is reached, the detailed guidance processing means 97 of the CPU 31 performs detailed guidance processing, reads the route data from the RAM 32, and displays the searched route on the map screen, thereby guiding the searched route to the driver. The detailed guidance processing means 97 sends a guidance command to the voice output processing means, and the voice output processing means performs voice output processing in accordance with the guidance command, and outputs the search route from the voice output unit 37 by voice. In this way, the driver can drive the vehicle along the searched route from the conspicuous property to the destination.
[0072]
In this way, a conspicuous property is set, so even if the driver is unfamiliar with the geography near the destination, the location of the destination can be imaged based on the conspicuous property, so the vehicle can be driven While you are, you will not feel anxious.
[0073]
In addition, when driving a vehicle along the searched route from the current location or starting point to the destination, the driver is required to always consider the guidance because the route is not guided until it reaches a conspicuous property. There is no. Therefore, the burden on the driver can be reduced when the vehicle is driven.
[0074]
By the way, as described above, even if the conspicuous property is set and a route from the conspicuous property to the destination is searched, the driver does not always drive the vehicle toward the conspicuous property. Therefore, in the present embodiment, before reaching a conspicuous property as necessary, guidance for a search route from the conspicuous property to the destination is started. Therefore, after the specific section search process is performed, when the vehicle has not reached a conspicuous property, the detailed guidance start condition establishment determination processing unit 96 of the CPU 31 performs a detailed guidance start condition establishment determination process, Whether or not the detailed guidance start condition is satisfied based on the current location and the searched route from the conspicuous property to the destination at predetermined intervals (2 minutes in the present embodiment) set in advance. When the detailed guidance start condition is satisfied, the detailed guidance processing unit 97 starts detailed guidance based on the search route obtained in the specific section search process. When the detailed guidance start condition is not satisfied, the vehicle Wait until a conspicuous property is reached or a detailed guidance start condition is satisfied.
[0075]
For this purpose, the detailed guidance processing means 97 reads the route data from the RAM 32 in accordance with the guidance command and displays the searched route on the map screen. The detailed guidance processing means 97 sends a guidance command to the voice output processing means, and the voice output processing means performs voice output processing in accordance with the guidance command, and outputs the search route from the voice output unit 37 by voice. In this way, the driver can drive the vehicle along the searched route from the current location to the destination.
[0076]
Even when the vehicle does not reach a conspicuous property, the search route is guided, which is extremely convenient.
[0077]
Next, a flowchart will be described.
Step S1: A destination is set.
Step S2 A conspicuous property setting process is performed.
Step S3: It is determined whether or not a conspicuous property has been set. If a conspicuous property is set, the process proceeds to step S6, and if not set, the process proceeds to step S4.
Step S4: Route search processing is performed.
Step S5: A guidance process is performed and the process is terminated.
Step S6: A specific section search process is performed.
Step S7: It is determined whether or not a conspicuous property has been reached. When it reaches a conspicuous property, it progresses to Step S9, and when it has not reached, it progresses to Step S8.
Step S8 A detailed guidance start condition establishment judgment process is performed.
Step S9: It is determined whether the detailed guidance start condition is satisfied. When the detailed guidance start condition is satisfied, the process proceeds to step S10, and when not satisfied, the process returns to step S7.
Step S10 The detailed guidance process is performed and the process is terminated.
[0078]
Next, a conspicuous property setting process subroutine in step S2 of FIG. 3 will be described.
[0079]
FIG. 4 is a diagram showing a conspicuous property setting process subroutine in the first embodiment of the present invention.
[0080]
The conspicuous property setting processing means 93 (FIG. 1) of the CPU 31 (FIG. 2) performs a conspicuous property setting process and sets a conspicuous property corresponding to the set destination. For this purpose, the conspicuous property candidate list creation processing means (not shown) of the conspicuous property setting processing means 93 performs the conspicuous property candidate list creation processing, and based on the navigation information, the predetermined candidate condition of each facility is established. Extract as a prominent property candidate and create a prominent property candidate list consisting of a list of one or more facilities.
[0081]
In the present embodiment, the conspicuous property candidate list created by the conspicuous property candidate creation process lists conspicuous property candidates in the order of proximity to the destination, and the setting processing means Although conspicuous properties are set, in other embodiments, conspicuous property candidates can be listed in any order. In that case, the display processing means 94 forms a list display screen on the display unit 35 and displays a conspicuous property candidate list on the list display screen. The conspicuous property candidate list includes the names of the facilities that are candidates for the conspicuous properties, the positional relationship between the facilities and the destination, and the like. Therefore, when the driver selects a predetermined facility based on the name of each facility that is a candidate for each conspicuous property, the positional relationship between the facility and the destination, etc., the setting processing means selects the selected facility. Set as a prominent property.
[0082]
When the candidate condition is not satisfied and the conspicuous property candidate list is an empty set, the display processing unit creates a conspicuous property display screen on the display unit 35, and no conspicuous property is found on the conspicuous property display screen. A message to that effect is displayed and the driver is notified that no conspicuous property was found. In this case, the display processing means constitutes a notification processing means, and the notification processing is performed by the notification processing means.
[0083]
On the other hand, if the candidate condition is satisfied and the conspicuous property candidate list is not an empty set, the not-illustrated setting processing unit of the conspicuous property setting processing unit 93 performs a setting process to move the conspicuous property candidate list to the destination. The closest facility is extracted, and the closest facility is set as a conspicuous property. The conspicuous property display processing means (not shown) of the conspicuous property setting processing means 93 displays the set conspicuous property by name on the conspicuous property display screen. In this case, in addition to the name, the positional relationship between the conspicuous property and the destination as necessary, for example, the distance from the conspicuous property to the destination, the direction from the conspicuous property to the destination, and the like are displayed. Whether or not it is closest to the destination is determined by a distance between the conspicuous property and the destination, for example, a linear distance between the coordinates of the conspicuous property and the coordinates of the destination.
[0084]
On the conspicuous property display screen, an OK key and a next key are formed. When the driver understands that the conspicuous property is set and clicks the OK key, the specific section search process starts as described above. If the driver does not understand that the conspicuous property has been set, when the driver clicks the next key, the setting processing means determines whether there is a facility next to the destination, and then If there is a facility close to, set the next closest facility as a prominent property. When the driver understands that the next closest facility has been set as a conspicuous property and clicks the OK key, the conspicuous property setting processing means 93 starts the specific section search process.
[0085]
Next, a flowchart will be described.
Step S2-1: Conspicuous property candidate list creation processing is performed.
Step S2-2: Determine whether the conspicuous property candidate list is an empty set.
If the conspicuous property candidate list is an empty set, the process proceeds to step S2-3. If not, the process proceeds to step S2-4.
Step S2-3: Notify that a conspicuous property was not found and return.
Step S2-4: The facility closest to the destination is set as a conspicuous property.
Step S2-5 Display conspicuous properties.
Step S2-6: It is determined whether the driver has accepted. If the driver approves, the process returns. If not, the process proceeds to step S2-7.
Step S2-7: It is determined whether there is a facility next to the destination. If there is a facility closest to the destination, the process returns to step S2-5, and if not, the process returns.
[0086]
Next, a conspicuous property candidate list creation process subroutine in step S2-1 of FIG. 4 will be described.
[0087]
FIG. 5 is a diagram showing a conspicuous property candidate list creation processing subroutine in the first embodiment of the present invention.
[0088]
First, the conspicuous property candidate list creation processing means sets a search range centered on the destination. In the present embodiment, for example, an area within a circle centered on the destination and having a predetermined radius is set as the search range.
[0089]
Subsequently, the conspicuous property candidate search processing means of the conspicuous property candidate list creation processing means performs conspicuous property candidate search processing, refers to the conspicuous property data file created in the facility information data file, and displays the conspicuous property data In accordance with the conspicuous property data recorded in the file, the facility existing in the search range is searched, and the in-range facility list is created.
[0090]
The prominent property data is a facility that has at least one of the size (area) and height that is equal to or higher than a preset standard value, and that satisfies certain conditions regardless of size and height, and is a prominent property. Specific facilities (for example, facilities with conspicuous signs, government offices, stations, schools, hospitals, etc.) are created and recorded by genre.
[0091]
Subsequently, the conspicuous property candidate extraction processing means of the conspicuous property candidate list creation processing means performs conspicuous property candidate extraction processing, and in the facilities in the in-scope facility list, is there a facility belonging to the genre designated by the driver? If there is a facility that belongs to the specified genre, the facility that belongs to the specified genre is extracted, and the route that passes through the facility is extracted from the extracted facilities from the route from the current location to the destination. Delete a facility longer than a certain length and create a conspicuous property candidate list.
[0092]
The conspicuous property candidate extraction processing means determines whether there is a facility having at least one of a size and a height that is greater than or equal to a threshold in the facilities in the facility list within the range. If at least one of the facilities is above the threshold, extract the facilities above the threshold, delete the facilities that are longer than a certain length from the current location to the destination, Create a conspicuous property candidate list. In addition, if the facility information data has only the size of the width and height, the facility whose width is equal to or larger than the threshold is extracted, and if the facility information data has only the height, the facility whose height is equal to or larger than the threshold is extracted. Then, the facility closest to the point Pe is selected as the conspicuous property Pf from the extracted facilities.
[0093]
In the present embodiment, it is determined whether or not there is a facility having at least one of a width and a height that is greater than or equal to a threshold in the facilities in the range facility list, and at least one of the width and the height is determined. If one of the facilities is above the threshold, the facilities above the threshold are extracted. However, if both the width and height are above the threshold, determine whether there is a facility with the width and height. If any of the facilities has a threshold value or more, a facility having a threshold value or more can be extracted.
[0094]
Further, the conspicuous property candidate extraction processing means judges whether there is a facility having an attribute as a conspicuous property in the facilities in the facility list within the range, and if there is a facility having an attribute as a conspicuous property, The facility having the attribute is extracted, and the facility that has a route longer than the current route from the current location to the destination is deleted from the extracted facilities, and a conspicuous property candidate list is created.
[0095]
And there are no facilities belonging to the specified genre among the facilities in the in-range facility list, there are no facilities where at least one of the width and height is equal to or greater than the threshold, and there are no facilities having attributes as conspicuous properties In this case, the conspicuous property candidate list creation processing means creates a conspicuous property candidate list of an empty set.
[0096]
In this way, facilities that have a route longer than a certain distance from the current location to the destination are deleted because the route that passes through the facility is deleted. In this case, it is possible to prevent the route from the current location to the destination from becoming significantly long.
[0097]
Next, a flowchart will be described.
Step S2-1-1: A search range centered on the destination is set.
Step S2-1-2: Search for facilities existing within the search range, and create a list of facilities within the range.
Step S2-1-3: It is determined whether there is a facility belonging to the specified genre. If there is a facility belonging to the specified genre, the process proceeds to step S2-1-4, and if there is no facility, the process proceeds to step S2-1-6.
Step S2-1-4: A facility belonging to the specified genre is extracted.
Step S2-1-5: Delete a facility whose route through the facility is longer than a certain distance from the current location to the destination, create a conspicuous property candidate list, and return.
Step S2-1-6: It is determined whether or not there is a facility in which at least one of the width and the height is greater than or equal to the threshold value. If there is a facility in which at least one of the width and height is equal to or greater than the threshold, the process proceeds to step S2-1-7, and if there is no facility, the process proceeds to step S2-1-8.
Step S2-1-7: A facility having a threshold value or more is extracted.
Step S2-1-8: It is determined whether there is a facility having an attribute as a conspicuous property. If there is a facility having an attribute as a conspicuous property, the process proceeds to step S2-1-9. If there is no facility, the process proceeds to step S2-1-10.
Step S2-1-9: A facility having an attribute as a conspicuous property is extracted.
Step S2-1-10 Create a candidate list of conspicuous empty sets and return.
[0098]
Next, the detailed guidance start condition establishment determination subroutine in step S8 of FIG. 3 will be described.
[0099]
FIG. 6 is a diagram showing a subroutine of detailed guidance start condition establishment judgment processing in the first embodiment of the present invention, and FIG. 7 shows the operation of detailed guidance start condition establishment judgment processing in the first embodiment of the present invention. It is a route diagram.
[0100]
First, the detailed guidance start condition establishment judgment processing means 96 (FIG. 1) reads the current location Pp at every predetermined timing (two minutes in the present embodiment), and in the specific section search process. The route data of the search route Rfg from the obtained conspicuous property Pf to the destination Pg is read from the RAM 32 (FIG. 2), and whether or not the detailed guidance start condition is satisfied based on the positional relationship between the current location Pp and the search route Rfg. to decide.
[0101]
In this case, it is determined whether or not the detailed guidance start condition is established depending on whether or not the current location Pp is on the searched route Rfg. For this reason, the detailed guidance start condition establishment judgment processing means 96 is specified in the matching process. It is determined whether the number of the road link where the current location Pp is located matches the number of the road link constituting the route data. If the numbers of both road links match, the current location Pp is on the searched route Rfg. If it is determined that the detailed guidance start condition is satisfied and the road link numbers do not match, it is determined that the current location Pp is not on the searched route Rfg and the detailed guidance start condition is not satisfied.
[0102]
As described above, when the vehicle is traveling, if the current location Pp is on the searched route Rfg, the detailed guidance start condition is satisfied, and the detailed guidance processing unit 97 determines that the current location Pp before the vehicle reaches the conspicuous property Pf. Guidance of the search route Rfg from to the destination Pg is started. In this case, since the distance from the current location Pp to the destination Pg in the searched route Rfg is shorter than the entire distance of the searched route Rfg to which the route is originally guided, the driver needs to always consider the guidance. The destination Pg can be reached with the shortest distance. Therefore, the vehicle can be driven comfortably.
[0103]
Next, a flowchart will be described.
Step S8-1: It is determined whether or not the current location Pp is on the searched route Rfg from the conspicuous property Pf to the destination Pg. If the current location Pp is on the search route Rfg from the conspicuous property Pf to the destination Pg, the process proceeds to step S8-3, and if not on the search route Rfg, the process proceeds to step S8-2.
Step S8-2 Waits for 2 minutes to elapse and returns to step S8-1 when 2 minutes elapse.
Step S8-3: It is determined that the detailed guidance start condition is satisfied, and the process returns.
[0104]
Next, a second embodiment of the present invention will be described.
[0105]
FIG. 8 is a main flowchart showing the operation of the navigation system according to the second embodiment of the present invention.
[0106]
In this case, the operations from step S1 to step S6 in FIG. 3 are the same as those in the first embodiment, and thus description thereof is omitted.
[0107]
Then, after the route from the conspicuous property to the destination is searched in the specific section search process, when the vehicle travels toward the conspicuous property, the CPU 31 (FIG. 2) as the arithmetic device and the control device is not shown. The arrival determination processing means performs arrival determination processing, determines whether or not the vehicle has reached a conspicuous property, and when the vehicle reaches a conspicuous property, the detailed guidance processing means 97 (FIG. 1) of the CPU 31 performs detailed guidance processing. The route data is read from the RAM 32, and the searched route is displayed on the map screen to guide the searched route to the driver. The detailed guidance processing means 97 sends a guidance command to the voice output processing means, and the voice output processing means performs voice output processing in accordance with the guidance command, and outputs the search route from the voice output unit 37 by voice. In this way, the driver can drive the vehicle along the searched route from the conspicuous property to the destination.
[0108]
By the way, as described above, the driver does not always drive the vehicle toward the conspicuous property. Therefore, in the present embodiment, when the specific section search process is performed and the vehicle has not reached a conspicuous property, the detailed guidance start condition establishment determination processing unit 96 of the CPU 31 performs the detailed guidance start condition establishment determination process. Whether the detailed guidance start condition is satisfied at a predetermined cycle, that is, at a predetermined timing (2 minutes in the present embodiment) based on the positional relationship between the current location and the conspicuous property When the detailed guidance start condition is satisfied, the re-search processing means (not shown) of the CPU 31 performs a re-search process, reads the current location, conspicuous properties, search data, etc., and reads the route data from the RAM 32, Based on conspicuous property, search data, route data, etc., a new route from the current location to the destination via the conspicuous property is searched. And outputs the route data representing a new search path, for recording the route data in the RAM 32.
[0109]
In the present embodiment, the re-search processing means searches for a route from the current location to the conspicuous property, and combines the search route from the current location to the prominent property with the search route obtained in the specific section search processing. The route to the destination via the conspicuous property is searched, but without reading the route data from the RAM 32, the route from the current location to the destination via the conspicuous property is determined using the conspicuous property as a passing point. You can also search for a new one.
[0110]
On the other hand, if the detailed guidance start condition is not satisfied, the vehicle waits until the vehicle reaches a conspicuous property or the detailed guidance start condition is satisfied.
[0111]
Subsequently, the detailed guidance processing means 97 performs detailed guidance processing, reads the route data from the RAM 32, and displays the searched route on the map screen, so that the driver can reach the destination via the conspicuous property from the current location. Guidance on the search route. The detailed guidance processing means 97 sends a guidance command to the voice output processing means, and the voice output processing means performs voice output processing in accordance with the guidance command, and outputs the search route from the voice output unit 37 by voice. In this way, the driver can drive the vehicle along the searched route to the destination via the conspicuous property from the current location.
[0112]
Next, a flowchart will be described.
Step S11: A destination is set.
Step S12 A conspicuous property setting process is performed.
Step S13: It is determined whether or not a conspicuous property has been set. If a conspicuous property is set, the process proceeds to step S16. If not, the process proceeds to step S14.
Step S14: Route search processing is performed.
Step S15 A guidance process is performed and the process is terminated.
Step S16: A specific section search process is performed.
Step S17: It is determined whether or not a conspicuous property has been reached. When it reaches a conspicuous property, it progresses to Step S20, and when it has not reached, it progresses to Step S18.
Step S18 Detailed guidance start condition establishment judgment processing is performed.
Step S19: It is determined whether the detailed guidance start condition is satisfied. When the detailed guidance start condition is satisfied, the process proceeds to step S20, and when not satisfied, the process returns to step S17.
Step S20 A re-search process is performed.
Step S21 A detailed guidance process is performed and the process is terminated.
[0113]
Next, the detailed guidance start condition establishment processing subroutine in step S18 of FIG. 8 will be described.
[0114]
FIG. 9 is a diagram showing a subroutine of detailed guidance start condition establishment judgment processing in the second embodiment of the present invention, and FIG. 10 shows the operation of detailed guidance start condition establishment judgment processing means in the second embodiment of the present invention. FIG.
[0115]
First, the detailed guidance start condition establishment judgment processing means 96 (FIG. 1) of the CPU 31 (FIG. 2) reads the current location Pp at every predetermined timing (2 minutes in the present embodiment), The conspicuous property Pf is read, and it is determined whether the detailed guidance start condition is satisfied based on the positional relationship between the current location Pp and the conspicuous property Pf. In the present embodiment, since the search route Rfg is calculated, the positional relationship between the current location Pp and the conspicuous property Pf represents the positional relationship between the current location Pp and the search route Rfg.
[0116]
In this case, the detailed guidance start condition establishment judgment processing means 96 reads data (for example, coordinates) representing the position of the current location Pp, the outstanding property Pf and the location of the destination Pg, and from the current location Pp to the outstanding property Pf. The distance Lpf is calculated as the first straight line distance, the distance Lfg from the conspicuous property Pf to the destination Pg is calculated as the second straight line distance, and the first straight line distance is shorter than the second straight line distance representing the threshold value. Whether or not the detailed guidance start condition is satisfied is determined. When the first straight line distance is shorter than the second straight line distance, the detailed guidance start condition establishment determination processing unit 96 determines that the detailed guidance start condition is established, and the first straight line distance is the second straight line distance. If the distance is equal to or greater than the distance, the detailed guidance start condition establishment determination processing unit 96 determines that the detailed guidance start condition is not established.
[0117]
As described above, when it is determined that the first linear distance from the current location Pp to the conspicuous property Pf is shorter than the second straight distance from the prominent property Pf to the destination Pg, the detailed guidance processing unit 97 makes the vehicle conspicuous. Before reaching the property Pf, guidance on the search route Rpfg (consisting of the search route Rpf and the search route Rfg) from the current location Pp to the destination Pg via the conspicuous property Pf is started. In this case, the searched route Rpfg is originally longer than the searched route Rfg on which the route is guided, but since the distance Lpf is shorter than the distance Lfg, the driver does not always need to consider the guidance. Therefore, the vehicle can be driven comfortably.
[0118]
In the present embodiment, the second linear distance is used as a threshold value for determining whether or not the detailed guidance start condition is satisfied. However, instead of the second linear distance, the second linear distance is used in advance. A set value can be used, or a function having a predetermined parameter as a variable can be used.
[0119]
Next, a flowchart will be described.
Step S18-1: It is determined whether the distance from the current location to the conspicuous property is shorter than the distance from the conspicuous property to the destination. If the distance from the current location to the conspicuous property is shorter than the distance from the prominent property to the destination, step S18-3. If the distance from the current location to the prominent property is greater than the distance from the prominent property to the destination, step S18- Proceed to 2.
Step S18-2 Waits for two minutes to elapse, and returns to step S18-1 when two minutes elapse.
Step S18-3: It is determined that the detailed guidance start condition is satisfied, and the routine returns.
[0120]
In the present embodiment, it is determined whether or not the first linear distance is shorter than the second linear distance, and it is determined that the detailed guidance start condition is satisfied when the first linear distance is shorter than the second linear distance. The route distance from the current location Pp to the conspicuous property Pf is calculated as the first route distance, and the route distance from the conspicuous property Pf to the destination Pg is calculated as the second route distance. In addition, it is possible to determine that the detailed guidance start condition is satisfied when the first route distance is shorter than the second route distance.
[0121]
In that case, since the route from the conspicuous property Pf to the destination Pg has already been searched as the search route Rfg in the specific section search process, the first route distance is calculated based on route data representing the search route Rfg. can do. On the other hand, the route from the current location Pp to the conspicuous property Pf needs to be searched before the detailed guidance start condition establishment determination process is performed. Therefore, after the specific section search process is performed, when the vehicle has not reached a conspicuous property, a re-search processing unit (not shown) of the CPU 31 performs a re-search process, and a route from the current location Pp to the conspicuous property Pf And a search route Rpf is obtained. The first route distance is calculated based on route data representing the searched route Rpf. In the re-search process, a route from the current location Pp to the destination Pg via the conspicuous property Pf can be searched to obtain a searched route Rpfg.
[0122]
In the present embodiment, the navigation information acquisition processing means 91, the destination setting processing means 92, the conspicuous property setting processing means 93, the display processing means 94, the detailed guidance start condition establishment judgment processing means 96 and the detailed guidance processing means 97 are included in the CPU 31. However, in another embodiment, the destination setting processing means 92 and the detailed guidance processing means 97 are provided in the CPU 31 to provide the navigation information acquisition processing means 91 and the conspicuous property setting processing. The means 93, the display processing means 94, and the detailed guidance start condition establishment judgment processing means 96 may be arranged in the CPU.
[0123]
In that case, when the destination setting processing unit 92 sets the destination in the navigation device 14, a transmission processing unit (not shown) of the CPU 31 performs transmission processing and transmits the destination to the information center 51 together with the current location. In the information center 51, the navigation information acquisition processing unit 91 acquires navigation information, and the conspicuous property setting processing unit 93 sets a conspicuous property corresponding to the set destination based on the navigation information. The CPU 31 searches for a route from the set conspicuous property to the destination, and outputs route data representing the searched route. Further, the detailed guidance start condition establishment determination processing means 96 determines whether or not the detailed guidance start condition is established based on the positional relationship between the current location and the searched route while the vehicle is traveling, and if the detailed guidance start condition is established. The transmission processing means (not shown) of the CPU 54 performs transmission processing and transmits the route data to the navigation device 14. In the navigation device 14, the detailed guidance processing means 97 guides the route from the current location to the destination according to the route data.
[0124]
In this embodiment, the navigation device 14 is used as an information terminal. In other embodiments, a mobile phone such as a mobile phone, a car phone, and a PHS is used as the information terminal. Or a personal computer, a portable computer, a personal digital assistant (PDA), an electronic notebook, a video phone, a game machine, or the like having a communication function.
[0125]
In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.
[0126]
【The invention's effect】
As described above in detail, according to the present invention, it is determined whether or not the detailed guidance start condition is satisfied based on the positional relationship between the current location and the searched route, and the searched route when the detailed guidance start condition is satisfied. Therefore, the driver does not always need to consider the guidance, and can drive the vehicle comfortably.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a navigation system according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a navigation system according to the first embodiment of the present invention.
FIG. 3 is a main flowchart showing the operation of the navigation system according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a conspicuous property setting process subroutine according to the first embodiment of the present invention.
FIG. 5 is a diagram showing a conspicuous property candidate list creation processing subroutine in the first embodiment of the present invention;
FIG. 6 is a diagram showing a subroutine of detailed guidance start condition establishment determination processing in the first embodiment of the present invention.
FIG. 7 is a route diagram showing an operation of detailed guidance start condition establishment determination processing in the first embodiment of the present invention.
FIG. 8 is a main flowchart showing an operation of the navigation system according to the second embodiment of the present invention.
FIG. 9 is a diagram showing a subroutine of detailed guidance start condition establishment determination processing in the second embodiment of the present invention.
FIG. 10 is a route diagram showing the operation of detailed guidance start condition establishment judgment processing means in the second embodiment of the present invention.
[Explanation of symbols]
14 Navigation device 17 Navigation processor 31 CPU
43 Network 51 Information Center 53 Server 91 Navigation Information Acquisition Processing Unit 92 Destination Setting Processing Unit 93 Conspicuous Property Setting Processing Unit 94 Specific Section Search Processing Unit 96 Detailed Guidance Start Condition Establishment Judgment Processing Unit 97 Detailed Guidance Processing Unit Pf Conspicuous Property Pg Purpose Location Pp Current location

Claims (4)

  Navigation information acquisition processing means for acquiring navigation information, destination setting processing means for setting a destination, and conspicuous property setting processing means for setting a conspicuous property corresponding to the set destination based on the navigation information And whether the detailed guidance start condition is satisfied based on the specific section search processing means for searching for the route from the set conspicuous property to the destination, and the positional relationship between the current location and the searched route while the vehicle is traveling A detailed guidance start condition establishment judgment processing means for judging whether or not, and a detailed guidance start condition establishment judgment means for guiding a route from the current location to the destination when the detailed guidance start condition is established. The processing means determines that the detailed guidance start condition is satisfied when the distance from the current location to the conspicuous property is shorter than the distance from the prominent property to the destination. Navigation system and butterflies. The detailed guidance start condition establishment determination processing means determines whether the detailed guidance start condition is satisfied based on whether the current location is on a route from the conspicuous property searched by the specific section search processing means to the destination. The navigation system according to claim 1 . And the navigation information acquisition processing means for acquiring Navi information, based on the navigation information, a prominent property setting means for setting a property to stand out in correspondence with the set destination, to the destination from the set prominent property Specific section search processing means for searching the route, and detailed guidance start condition establishment determination processing for determining whether or not the detailed guidance start condition is established based on the positional relationship between the current location and the searched route while the vehicle is traveling Means and a transmission processing means for transmitting a route from the current location to the destination when the detailed guidance start condition is established, and the detailed guidance start condition establishment judgment processing means is configured so that the distance from the current location to the conspicuous property is features and be Luna navigation system to determine if shorter than the distance to the destination from the prominent properties, and detailed guide start condition is satisfied.   Navigation information acquisition processing means for acquiring navigation information, destination setting processing means for setting a destination, and conspicuous property setting processing for setting a conspicuous property corresponding to the set destination based on the navigation information Means, specific section search processing means for searching a route from the set conspicuous property to the destination, whether the detailed guidance start condition is satisfied based on the positional relationship between the current location and the searched route while the vehicle is traveling And a detailed guidance start condition establishment determination processing means, and when the detailed guidance start condition is established, the detailed guidance start condition establishment judgment processing means, and the detailed guidance start condition establishment judgment processing When the distance from the current location to the conspicuous property is shorter than the distance from the prominent property to the destination, the detailed guidance start condition is satisfied. Program and determines that.

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