JP2006194675A - Navigation device, routing assistance method, routing assistance program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device capable of acquiring errors and the like of the arrival time and the like at a destination site (time error and distance error) on any reroute searching. <P>SOLUTION: A control section 1 of the navigation device 79 derives a first travel distance to a re-junction site via an optimal root from any departed site, using map data, and further derives a second travel distance to a re-junction site via the current site and a reroute from the departed site, using map data. Finally, the control section 1 displays a difference metric (predicted distance loss) or a difference between the aforementioned first travel distance and the second travel distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device or the like in which route guidance (reroute search) is performed again from a departure point when the route deviates from a route that has been once guided (optimum route).

  Usually, in a vehicle equipped with a navigation device, a user drives the vehicle according to a route guided by the navigation device. However, if it is determined that the route you know can go to your destination in a shorter time than the route that is guided by the navigation device, or if you travel on the route incorrectly, you will deviate from the optimum route that is being guided. May end up.

As described above, there is a navigation device having a reroute search function that automatically performs a re-search from a departure point of the vehicle when the vehicle deviates from the optimum route (Patent Document 1, etc.).
JP 2003-139554 A

  However, in such a navigation device of Patent Document 1, it is unclear how much time difference occurs in the arrival time between the new route derived by the reroute search function and the optimal route previously derived. . For this reason, it is difficult for the user to determine how much the arrival time at the destination has gone wrong because the user has deviated from the optimum route.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a navigation device that informs a user of a time error, a distance error, etc. caused by deviating from an optimum route. It is in.

  According to the present invention, a position detection unit that detects at least a position and a speed, a destination route search that searches for a first guidance route to a destination point located on map data, and a detection position of the position detection unit is the first position. When deviating from the guide route, a control unit that performs a reroute search for searching for a second guide route from the current point after the departure to the rejoining point that returns to the first guide route, and a notification unit that notifies the guide route The control unit uses the map data to determine a first travel distance from the departure point to the rejoining point via the first guidance route and the map. Using the data, the second mileage from the departure point to the rejoining point via the current point and the second guidance route is obtained, and the first mileage The beauty the notifying unit at least one of the second travel distance, is characterized in that is broadcast.

  In addition, it is preferable that the control unit notifies a difference distance that is a difference between the first travel distance and the second travel distance.

  In the navigation device of the present invention, the control unit travels from the departure point to the rejoining point via the first guidance route using the detection speed of the position detection unit and the map data. The first travel time required for the vehicle is obtained, and the travel speed from the departure point to the rejoining point through the current point and the second guidance route is calculated using the detected speed and the map data. It is preferable that the second traveling time is obtained and at least one of the first traveling time and the second traveling time is notified by the notification unit.

  Furthermore, it is preferable that the control unit informs a difference time that is a difference between the first travel time and the second travel time.

  The rejoining point is a midway point in the first guidance route or the destination point.

  According to this, since the user deviates from the first guide route, the user can recognize how much the error occurs in the arrival time at the destination point. Also, by referring to the error time (difference time) and error distance (difference distance), for example, go to the destination point via the waypoint that was intended to reach the destination point, or pass through the waypoint It is possible to select whether to go to the destination point without any problem. That is, the navigation device of the present invention can provide a large number of materials for determining the guidance route selection.

  According to the present invention, since the user deviates from the first guidance route, the user can recognize how much the error occurs in the arrival time at the destination point.

An embodiment of the present invention will be described below with reference to the drawings.
[Embodiment 1]
[Configuration of navigation device, etc.]
FIG. 2 is a block diagram showing a configuration of a navigation device 79 mounted on a vehicle (not shown).

  As shown in FIG. 2, the navigation device 79 includes at least a position sensor group (vehicle position detection unit) 19, a media broadcast receiving unit 21, an HDD (storage unit) 22, a monitor (informing unit) 3, a speaker (informing unit). ) 4, operation button group (input unit) 5, timer (elapsed time measuring unit) 6, built-in battery 23, RAM (Random Access Memory) 24, ROM (Read Only Memory) 25, and control unit 1 Has been.

  The position sensor group 19 is configured to include a speed detection unit 11, a GPS (Global Positioning System) positioning unit 12, a gyroscope 13, a distance detection unit 14, and a geomagnetism detection unit 15.

  The speed detection unit 11 detects a speed based on the rotation state of an axle provided in the vehicle, and the GPS positioning unit 12 uses a radio wave signal (GPS signal) from a GPS satellite to calculate the latitude / It specifies longitude and altitude.

  The gyroscope 13 is incorporated as an auxiliary means when radio waves from GPS satellites cannot be received, and uses the axes corresponding to the three directions, front / rear / left / right / up / down, to obtain the relative position from the reference point. It is.

  The distance detection unit 14 detects a travel distance from acceleration and the like in the longitudinal direction of the vehicle, and the geomagnetism detection unit 15 detects the traveling direction of the vehicle from the geomagnetism.

  The media broadcast receiving unit 21 receives a TV broadcast signal and a radio broadcast signal transmitted from a TV (TeleVision) broadcast station or a radio broadcast station via a media broadcast reception antenna.

  An HDD (Hard Disk Drive) 22 stores map information (map data), video information / audio information (video / audio information) based on TV broadcast signals / radio broadcast signals, and the like. Note that the map data or the like is not limited to the HDD 22 but may be a CD (Compact Disc), a DVD (Digital Versatile Disk), or the like.

  The monitor (display unit) 3 is composed of, for example, a liquid crystal panel, and displays map information, video information based on TV broadcast signals, and the like.

  The speaker (sound emitting unit) 4 emits sound information and the like based on TV broadcast signals and radio broadcast signals, and emits navigation guidance sound and the like.

  The timer 6 measures elapsed time. For example, the timer 6 measures elapsed time after deviating from an optimum route (described later).

  The operation button group (operation unit) 5 includes at least a navigation / TV key 50, a recording start key 51a, a recording stop key 51b, a map enlargement key 52a, a map reduction key 52b, a route setting key 53, a return route key 54, and all routes. A key 55, a volume increase key 56a, a volume decrease key 56b, and a four-direction key 57 / ENTER key 58 are included. The operation button group 5 may be expressed as the operation button 5.

  The navigation / TV key 50 determines whether to display navigation information or the like (navigation setting screen or map information) by the navigation device 79 on the monitor 3, or to display TV broadcast video information or the like. is there.

  The recording start key 51a and the recording stop key 51b are for determining whether to record the audio / video information in the HDD 22 or to stop the recording.

  The map enlargement key 52a and the map reduction key 52b are used to determine whether to enlarge or reduce a map image (map data) used for navigation (route guidance).

  The route setting key 53 is used to input information on a place (that is, a destination point) that the user wants to go to and to start searching for an optimum route (optimum route) corresponding to the destination point.

  When the return route key 54 deviates from the optimum route, the route (return route) from the point (deviation point) to the optimum route is displayed on the monitor 3.

  The all route key 55 displays all routes (all routes) from the point (deviation point) to the destination point on the monitor 3 when deviating from the optimum route.

  The volume increase key 56a and the volume decrease key 56b are for causing the control unit 1 to determine whether to increase or decrease (UP / DOWN) the volume based on the audio information.

  The four-direction key 57 and the ENTER key 58 are used to perform various operations (for example, display of the traveling direction).

  The built-in battery 23 is a battery that can store power by receiving power supplied from a vehicle-mounted battery battery (not shown), for example. By providing the built-in battery 23, the navigation device 79 can operate even when it is removed from the vehicle, for example.

  The RAM 24 stores processing results (such as navigation guidance results) by the control unit 1, and the ROM 25 stores control programs for operating the navigation device 79.

  The control unit 1 is a central part that performs operation control and the like of the navigation device 79 as a whole, and organically controls driving of each member of the navigation device 79 to control the navigation operation in an integrated manner.

  For example, the control unit 1 includes a GPS signal from the GPS positioning unit 12 in the position detection sensor group 19, a position signal from the gyroscope 13, a travel distance signal from the distance detection unit 14, and a traveling direction from the geomagnetic detection unit 15. The position of the vehicle or the like is determined from the signal or the like.

  If it is determined that the vehicle has deviated from the optimal route by this determination, the return route (route returning to the rejoining point) that rejoins the optimal route from the deviated position (deviation point), and the departure point A new route (all routes) to a destination point (also called a rejoining point) is guided (reroute search is performed).

  In particular, the predicted travel distance / predicted travel time from the departure point to the rejoining point on the optimal route (the optimal route predicted travel distance / optimum route predicted travel time) and the deviation on the reroute (return route or all routes) Difference distance / time difference from predicted travel distance / predicted travel time (return route predicted travel distance / return route predicted travel time or all route predicted travel distance / all route predicted travel time) It is designed to be displayed on the monitor.

Not the difference distance / difference time, but the optimal route prediction travel distance / optimum route prediction travel time and return route prediction travel distance / return route prediction travel time (or all route prediction travel distance / all route prediction travel time) It may be displayed.
[About the road registration process in the navigation device of the present invention]
Here, with respect to the process (method) in which the control unit 1 described above displays the difference distance / difference time (loss prediction distance / loss prediction time), the flowchart of FIG. 1 and the route explanatory diagrams of FIGS. I will explain.

  Each step in the flowchart is denoted as S. 3 to 6, the optimum route derived by the navigation device 79 is indicated by a one-dot chain line, for example, a route search that is not displayed on the monitor 3 but performed by the control unit 1 is indicated by a dotted line, and a route that has been traveled is indicated by a solid line. The route from the departure point is indicated by a two-dot chain line.

  First, it is assumed that the user wants to go to a destination point C, for example, by approaching a certain place from the departure point (a) (by waypoint B). Therefore, the user uses the route setting key 53 to input the departure point A, the waypoint B, and the destination point C into the navigation device 79 (S1). Then, the navigation device 79 guides the optimum route from the starting point i to the destination point c passing through the way point b (see FIG. 3).

  Note that the distance from the departure point A to the waypoint B (distance A) and the distance from the waypoint B to the destination point C (distance B) can be obtained from the map data. In addition, the control unit 1 obtains a time (expected travel time) required for traveling on the optimum route from the average speed of the vehicle and the distance A and the distance B. The control unit 1 may display the distance A / distance B (predicted travel distance) and the predicted travel time on the monitor 3.

  Next, the user causes the vehicle to travel according to the optimum route (S2). However, the user may accidentally deviate from this optimum route (S3).

  Then, control is performed from the GPS signal from the GPS positioning unit 12 in the position detection sensor group 19, the position signal from the gyroscope 13, the travel distance signal from the distance detection unit 14, the traveling direction signal from the geomagnetic detection unit 15, and the like. The unit 1 recognizes that the vehicle has deviated from the optimum route. Therefore, the control unit 1 records the departure point D on the map data (S4; see FIG. 4).

  In addition, the control unit 1 searches for a return route (reroute search) for returning from the position of the vehicle after passing the departure point (current point e in FIG. 4) to a point where it can join the optimal route (rejoin point). Then, the entire route search (reroute search) for directly traveling from the current point E to the destination point C is performed (S5).

  At this stage, as shown in FIG. 4, the return route from the current location E to the rejoining location and the entire route from the current location E to the destination location C are not displayed on the monitor 3. (Dotted line shown).

  However, the error time / error distance (loss prediction time / loss prediction distance) that can occur between the return route or all routes and the optimal route is displayed on the monitor 3. Yes.

  And this loss prediction distance and loss prediction time are calculated | required as follows.

<Estimated loss for return route (X1km)>
First, the control unit 1 uses the map data to obtain a first travel distance (distance A2α) from the departure point D to the rejoining point via the optimum route [first travel distance calculation step], and map data. Is used to obtain the second travel distance (distance Pα + distance Rα) from the departure point D to the rejoining point via the current point e and the return route [second travel distance calculation step]. And the control part 1 calculates | requires the distance (loss estimated distance; X1km) of a difference by subtracting this 1st distance and 2nd distance [difference distance calculation process].

<Estimated loss time for return route (Y1 min)>
First, the travel time (first travel time) required for the control unit 1 to travel from the departure point D to the rejoining point using the vehicle speed and map data by the speed detection unit 11 through the optimum route. [First travel time calculation step]. Furthermore, the control unit 1 uses the vehicle speed / map data to calculate the travel time (second travel time) required to travel from the departure point D to the rejoining point via the current point E and the return route. [Second travel time calculation step]. And the control part 1 calculates | requires the time (loss estimated time; Y1 minute) of a difference by subtracting this 1st driving time and 2nd driving time [difference time calculation process].

<Estimated loss distance (X2km) for all routes>
First, the control unit 1 uses the map data to obtain a first travel distance (distance A2α + distance A3α + distance B) from the departure point d through the optimum route to the destination point c as a rejoining point [first Travel distance calculation step] Using the map data, the second travel distance (distance Pα + distance Qα) from the departure point d to the destination point c, which is the rejoining point, is obtained through the current point e and all routes. [Second travel distance calculation step]. And the control part 1 calculates | requires the difference distance (loss estimated distance; X2km) by subtracting this 1st driving distance and the 2nd driving distance [difference distance calculation process].

<Estimated loss time for all routes (Y2 minutes)>
First, using the vehicle speed and map data from the speed detection unit 11, the control unit 1 travels from the departure point D to the destination point C, which becomes the rejoining point, through the optimal route (first time) 1 travel time) [first travel time calculation step]. Further, the control unit 1 uses the vehicle speed / map data to travel from the departure point D to the destination point C which is the rejoining point through the current point e and all routes (second time) Travel time) [second travel time calculation step]. And the control part 1 calculates | requires the time (loss estimated time; Y2 minutes) of a difference by subtracting this 1st driving time and 2nd driving time [difference time calculation process].

  As described above, the control unit 1 displays the calculated loss prediction distance (X1 · X2) and loss prediction time (Y1 · Y2) on the monitor 3 as shown in FIG. (Notification process; S6).

  The user can select the display of the return route or the entire route by using the return route key 54 or the entire route key 55 by looking at the monitor 3 displayed in this way (S7).

  Note that it is not always necessary to select either route (return route or all routes). This is because the user may intentionally deviate from the optimum route. In this case, the control unit 1 continuously displays the loss prediction distance (X1 · X2) and the loss prediction time (Y1 · Y2) on the monitor 3 (S7 → S8).

  On the other hand, when the return route is selected (YES in S7, YES in S9), that is, when the return route key 54 is pressed, the return route is displayed as shown in FIG. 5 (S10). . In FIG. 5, a return route (from the reroute display point to the rejoining point ') from the point where the return route key 54 is pressed (reroute display point) to the optimum route is displayed. Yes.

  When the return route is displayed in this way, the control unit 1 also displays the estimated loss distance (X1) and estimated loss time (Y1) in the case of the return route.

  Note that the estimated loss distance (X1) on the return route shown in FIG. 5 is the distance (distance Pβ) from the departure point D to the reroute display point G and the reroute display point G to the rejoining point on the return route. It consists of a difference between the total distance (distance Pβ + distance Rβ) of the distance (distance Rβ) to the distance (distance A2β) from the departure point d to the rejoining point on the optimal route (distance Pβ + distance). Rβ-distance A2β). The estimated loss time (Y1) is a difference between the time required for the vehicle to travel (distance Pβ + distance Rβ) and the time required to travel (distance A2β).

  Further, the current point “e” in FIG. 5 indicates the current point of the vehicle traveling on the return route.

  When all routes are selected (YES in S7, NO in S9), that is, when all route keys 55 are pressed, all routes are displayed as shown in FIG. 6 (S11). . In FIG. 6, the entire route (from the reroute display point to the destination point c that is the rejoining point) from the point where the all route key 55 is pressed (reroute display point) to the destination point C is displayed. It is like that.

  In this way, when all routes are displayed, the control unit 1 is configured to display the estimated loss distance (X2) and estimated loss time (Y2) in the case of all routes.

  The estimated loss distance (X2) for all routes shown in FIG. 6 is the distance (distance Pβ) from the departure point D to the reroute display point G, and from the reroute display point to the destination point C for all routes. The total distance (distance Pβ + distance Qβ) with the distance (distance Qβ), the distance (distance A4) from the departure point D to the waypoint B on the optimum route, and the distance from the waypoint B to the destination point ( It consists of the difference from the total distance up to (distance B) ((distance Pβ + distance Qβ) − (distance A4 + distance B)). The estimated loss time (Y2) is a difference between the time required for the vehicle to travel (distance Pβ + distance Qβ) and the time required to travel (distance A4 + distance B).

  Further, the current point “e” in FIG. 6 indicates the current point of the vehicle traveling on the return route.

  As described above, while observing the estimated loss distance and estimated loss time on the monitor 3 (the estimated loss distance and estimated loss time on the monitor 3 at S8, S10, or S11), the user can move the vehicle to the destination point c. (S12).

[Examples of various features of the present invention]
As described above, the navigation device 79 of the present invention includes at least the position detection sensor group 19 that detects the position and speed, and the target route for searching for the optimum route (first guidance route) to the destination point located on the map data. When the search and the detection position of the position detection sensor group 19 deviate from the optimum route, a reroute (return route or all routes; second route) from the current point after the departure to the rejoining point returning to the optimum route is performed. A control unit 1 that performs a reroute search for searching and a monitor 3 that displays an optimal route / reroute are provided.

  Then, the control unit 1 uses the map data to obtain the first travel distance from the departure point through the optimum route to the rejoining point, and from the departure point through the current point and the reroute using the map data. The second travel distance to the meeting point (which may be the destination point) is obtained. In addition, the control unit 1 displays (notifies) at least one of the first travel distance and the second travel distance on the monitor 3.

  As described above, the first travel distance and the second travel distance may be displayed on the monitor 3, but in order to make it easier for the user to understand, the control unit 1 performs the first travel distance described above. A difference distance (loss predicted distance) that is a difference between the distance and the second travel distance is displayed.

  The control unit 1 can display not only the distance but also the time. Specifically, using the detection speed (vehicle speed, etc.) detected by the position detection sensor group 19 and map data, the first travel time required to travel from the departure point to the rejoining point via the optimum route is obtained. Using the detected speed and map data, the second travel time required to travel from the departure point to the rejoining point (which may be the destination point) via the current point and reroute is also obtained. Then, the control unit 1 displays at least one of the first travel time and the second travel time on the monitor 3.

  As described above, the first traveling time and the second traveling time may be displayed on the monitor 3, but in order to make it easier for the user to understand, the control unit 1 performs the first traveling time. A difference time (loss estimated time) that is a difference between the time and the second travel time is displayed.

With the navigation device 79 of the present invention, the user can recognize how much an error occurs in the arrival time at the destination point because the user deviates from the optimum route. Also, by referring to the error time and error distance, it is possible to select whether to go to the destination point via the waypoint (see FIGS. 3 to 6) or to go to the destination without going through the waypoint can do. That is, the navigation device 79 of the present invention can provide a large number of route selection determination materials.
[Other embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in order to inform the user of the estimated loss distance and the estimated loss time, the monitor 3 displays them in the above description. However, the present invention is not limited to this, and for example, the loss prediction distance / loss prediction time may be passed through the speaker 4. In this way, the user can recognize the estimated loss distance and the estimated loss time without removing the line of sight from the windshield during driving.

  Moreover, although the case where the return route key 54 of the operation button group 5 or the all route keys 55 is used as means for selecting the reroute display has been described, the present invention is not limited to this. For example, a touch panel that can be selected by directly touching a cursor or the like displayed on the monitor 3 may be used.

  Further, the present invention is not limited to the touch-type operation such as the return route key 54 or the touch panel, and may be voice recognition that can be selected by the user issuing a reroute type toward the sound collecting microphone. Specifically, the control unit 1 analyzes the words collected by the sound collecting microphone and identifies the reroute (return route or all routes) issued.

  If the reroute display can be selected by such voice recognition, the user can select and display the reroute type without removing the line of sight from the windshield during driving as described above.

  Further, the reroute search may be periodically performed by measuring the elapsed time after deviating from the optimal route using the timer 6.

  Moreover, each part (for example, control part 1 etc.) of the navigation apparatus 79 of this invention is implement | achieved also by the program (for example, route guidance program) for functioning them. This program is a program to be executed by a computer and can be recorded on a computer-readable recording medium.

  As a result, the road registration program can be provided as a recording medium in a portable manner.

  As the recording medium, since processing is performed by a microcomputer, a memory such as a ROM may be a program medium. In addition, a program reading device may be provided as an external storage device (not shown), and the program medium may be read by inserting a recording medium therein.

  In any case, the stored program may be executed by access by a microprocessor (for example, the control unit 1). Alternatively, in any case, a program may be read and the read program may be executed after being downloaded to a program storage area (not shown). It is assumed that the download program is stored in the main device (navigation device 79) in advance.

  Here, the program medium is a recording medium configured to be separable from the main body (navigation device 79), for example, a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a floppy (registered trademark) disk or a hard disk, CD-ROM / MO / MD / DVD and other optical disk systems, IC cards (including memory cards) / optical card systems, mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electronically Erasable and Programmable Read Only Memory) or a medium that carries a fixed program including a semiconductor memory such as a flash memory may be used.

  Further, the navigation device 79 of the present invention can be configured to be connectable to a communication network including the Internet. Therefore, it may be a medium that fluidly carries the program so as to download the program from the communication network.

  When downloading a program from the communication network in this way, the download program is stored in advance in the main unit (navigation device 79) or installed from another recording medium. Also good.

  INDUSTRIAL APPLICABILITY The present invention is useful for a navigation apparatus in which route guidance (reroute search) is performed again from a departure point when the route deviates from the once route (optimum route).

It is a flowchart which shows the navigation process (route guidance) in the navigation apparatus of this invention. It is a block diagram which shows the structure of the navigation apparatus of this invention. It is route explanatory drawing which shows the optimal route from a starting point to a destination point via a waypoint. It is route explanatory drawing which shows having recorded the deviation point on map data. It is route explanatory drawing which shows a return route. It is route explanatory drawing which shows all the routes.

Explanation of symbols

1 Control unit 3 Monitor (notification unit, display unit)
4 Speaker (notification part, sound emission part)
5 Operation buttons (input unit, touch operation unit)
6 Timer (Elapsed time measurement unit)
DESCRIPTION OF SYMBOLS 11 Speed detection part 12 GPS positioning part 13 Gyroscope 14 Distance detection part 15 Geomagnetic detection part 19 Position detection sensor group (vehicle position detection unit)
22 HDD
53 Route Setting Key 54 Return Route Key 55 All Route Keys 55 Intersection Selection Key 79 Navigation Device

Claims (17)

A position detection unit for detecting at least position and speed;
A destination route search for searching for a first guidance route to a destination point located on the map data, and when the detection position of the position detection unit deviates from the first guidance route, the first point from the current point after departure A control unit that performs a reroute search to search for a second guidance route to a rejoining point that returns to the guidance route;
In a navigation device including a notification unit that notifies the above guidance route,
The control unit
Using the map data, the first travel distance from the departure point to the rejoining point through the first guidance route is obtained,
Using the map data, find the second mileage from the departure point to the rejoining point via the current point and the second guidance route,
A navigation device characterized in that at least one of the first travel distance and the second travel distance is notified by the notification section. Furthermore, the control unit
The navigation apparatus according to claim 1, wherein a difference distance that is a difference between the first travel distance and the second travel distance is notified. Furthermore, the control unit
Using the detection speed in the position detection unit and the map data, the first travel time required to travel from the departure point to the rejoining point through the first guidance route,
Using the detected speed and the map data, obtain the second travel time required to travel from the departure point to the rejoining point via the current point and the second guidance route,
The navigation device according to claim 1, wherein at least one of the first traveling time and the second traveling time is notified by the notification unit. Furthermore, the control unit
The navigation apparatus according to claim 3, wherein a difference time that is a difference between the first travel time and the second travel time is notified. The navigation device according to any one of claims 1 to 4, wherein the rejoining point is a midway point in the first guidance route or the destination point. The navigation device according to claim 1, wherein the notification unit is a display unit or a sound emitting unit. Detect at least position and velocity,
Target route search for searching for a first guidance route to a destination point located on the map data, and when the detected position deviates from the first guidance route, the first guidance route from the current point after the departure Perform a reroute search to find the second guidance route to the rejoining point back to
In the route guidance method of the navigation device for notifying the above guidance route,
Using the map data, a first travel distance calculating step for obtaining a first travel distance from the departure point to the rejoining point via the first guidance route;
Using the map data, a second travel distance calculating step for obtaining a second travel distance from the departure point to the rejoining point through the current point and the second guidance route;
A route guidance method for a navigation device, comprising: a notifying step for notifying at least one of the first travel distance and the second travel distance. Furthermore, a differential distance calculating step for obtaining a differential distance that is a difference between the first travel distance and the second travel distance is included.
The route guidance method for a navigation device according to claim 7, wherein the difference distance is notified in the notification step. Furthermore, a first travel time calculating step for obtaining a first travel time required to travel from the departure point to the rejoining point through the first guidance route using the detected speed and the map data. When,
Second travel for obtaining a second travel time required to travel from the departure point to the rejoining point through the current point and the second guidance route using the detected speed and the map data. A time calculation step;
9. The route guidance method for a navigation device according to claim 7, wherein at least one of the first travel time and the second travel time is reported in the notification step. And a difference time calculation step for obtaining a difference time which is a difference between the first travel time and the second travel time.
10. The route guidance method for a navigation device according to claim 9, wherein in the notification step, the difference time is notified. The route guidance method for a navigation device according to any one of claims 7 to 10, wherein the re-merging point is a midway point in the first guidance route or the destination point. A position detection unit for detecting at least position and speed;
A destination route search for searching for a first guidance route to a destination point located on the map data, and when the detection position of the position detection unit deviates from the first guidance route, the first point from the current point after departure A control unit that performs a reroute search to search for a second guidance route to a rejoining point that returns to the guidance route;
In a route guidance program for a navigation device provided with a notifying unit for notifying the guidance route,
In the control unit,
Using the map data, functioning to obtain the first travel distance from the departure point to the rejoining point through the first guidance route,
The map data is used to function to obtain the second travel distance from the departure point to the rejoining point through the current point and the second guidance route,
A route guidance program for a navigation device, characterized in that at least one of the first travel distance and the second travel distance is caused to function by the notification unit. Furthermore, the control unit
The route guidance program for the navigation device according to claim 12, wherein the route guidance program functions to notify a difference distance that is a difference between the first travel distance and the second travel distance. Furthermore, the control unit
Using the detection speed in the position detection unit and the map data, the first traveling time required to travel from the departure point to the rejoining point through the first guidance route is functioned,
Using the detected speed and the map data, while functioning to obtain the second travel time required to travel from the departure point to the rejoining point through the current point and the second guidance route,
The route guidance program for a navigation device according to claim 12 or 13, wherein at least one of the first traveling time and the second traveling time is caused to function by the notification unit. Furthermore, the control unit
The route guidance program for a navigation device according to claim 14, wherein the route guidance program functions to notify a difference time which is a difference between the first travel time and the second travel time. The route guidance program for a navigation device according to any one of claims 12 to 15, wherein the rejoining point is a midway point in the first guidance route or the destination point. The computer-readable recording medium which recorded the route guidance program of the navigation apparatus of any one of Claims 12-16.

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