JP3570149B2 - Navigation device and automobile - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, for example, receives road traffic information multiplexed on radio broadcast waves, and displays the received traffic information together with a road map and the like.RunaThe present invention relates to a navigation device and an automobile including the navigation device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various navigation devices to be mounted on an automobile or the like have been developed. This navigation device includes, for example, a large-capacity data storage unit such as a CD ROM in which road map data is stored, a current position detection unit, and a road map near the detected current position in data read from the data storage unit. And a display device for displaying based on the information. In this case, as a means for detecting the current position, a means using a positioning system (hereinafter simply referred to as GPS) using an artificial satellite for positioning called GPS (Global Positioning System), a traveling direction of the vehicle, and a traveling direction are used. For example, there is an autonomous navigation system that tracks a change in the current position from a departure point based on information such as speed.
[0003]
Then, data of a road map near the current position detected by the current position detecting means is read from a large-capacity data storage means such as a CD ROM, and a video signal for displaying the road map is created. A video signal is supplied to a display device to display a road map near the current position.
[0004]
By the way, there is a navigation device that not only displays a road map or the like but also receives traffic information such as road congestion information and displays the received traffic information on a road map or the like. . In this case, as a method of receiving traffic information, for example, in the case of a system called VICS (Vehicle Information and Communication System), a data broadcast multiplexed with FM broadcast (radio broadcast) and transmitted from a broadcast station is received. There is a case where an infrared signal or a radio wave transmitted from a beacon installed near a road is received when passing near the beacon.
[0005]
By receiving such traffic information by the navigation device and performing a corresponding display or the like, information such as ever-changing road congestion information and traffic regulation can be received and guided in the traveling vehicle. For example, based on the displayed information, the driver can determine an appropriate route that avoids congestion. In the case of a navigation device capable of setting a route to a destination, it is also possible to automatically set a route that avoids traffic congestion based on the received information and provide guidance.
[0006]
[Problems to be solved by the invention]
By the way, when receiving and obtaining traffic information multiplexed on a broadcast wave by the above-mentioned VICS method or the like, it is necessary to appropriately select and receive a channel (frequency) on which the traffic information is multiplexed. For example, in a method currently in practical use in Japan, the frequency of a broadcast wave for transmitting traffic information of each prefecture is predetermined for each prefecture, and the position (city) at that time is determined by a user operation or the like. It was necessary to set the receiving frequency to the frequency at which traffic information of (prefecture) was obtained.
[0007]
Then, when the vehicle equipped with the navigation device travels and the position changes (for example, when the vehicle travels in another prefecture), it is necessary to change the frequency for receiving the traffic information.
[0008]
Here, when traffic information multiplexed on a conventional broadcast wave is received, the process of changing the reception / reception uses adjacent broadcast station information included in the information multiplexed on the broadcast wave. Was. That is, when traffic information and the like are multiplexed on a broadcast wave, the multiplexed information includes information on transmission frequencies of adjacent broadcast stations on the same network. Then, when the reception state of the currently received broadcast wave deteriorates, an attempt is made to receive the adjacent broadcast station indicated by the adjacent broadcast station information. A process for switching to reception by a broadcasting station is performed.
[0009]
However, searching for a station that can be satisfactorily received based on the information of the adjacent broadcast station and switching to the reception of that station as described above may result in a station that can always obtain traffic information near the traveling position at that time. There was a problem that was not always received. In other words, even if a broadcasting station that multiplexes and transmits traffic information exists on a per-prefecture basis, in a region near the prefectural border, a broadcasting station in an adjacent prefecture is better than a broadcasting station in the prefecture to which the position belongs. In many cases, better reception is possible, and if the reception frequency is switched based solely on the information of the adjacent broadcasting station to be transmitted, traffic information on the road on which the vehicle is currently traveling cannot be obtained, and another area (prefecture) May be received.
[0010]
Therefore, if traffic information and the like are received with automatic frequency setting, there is a possibility that traffic information in an area different from the traveling position at that time may be received, and it is necessary to obtain information on a necessary area. There was no problem.
[0011]
Here, the case where traffic information is received has been described. However, information multiplexed on a broadcast wave such as an FM broadcast and transmitted includes other information. For example, information such as a weather forecast and news is also transmitted. I have to do it. Also when receiving such information, there is a problem that if the area indicated by the information (for example, the area for weather forecast) does not match the current position, the received information becomes meaningless.
[0012]
In view of the above, it is an object of the present invention to appropriately set a reception frequency when information such as traffic information in a limited area is received.
[0013]
[Means for Solving the Problems]
In order to solve such a problem, the present invention provides:A navigation device that receives traffic information transmitted at a predetermined broadcast frequency and displays the traffic information together with a road map, or a current position positioning means for positioning a current position in an automobile equipped with the navigation device; Receiving means for receiving traffic information transmitted by frequency, and dividing the broadcast frequency of each broadcasting station and the range of each traffic information area provided by each broadcasting station into meshes, assigning a mesh management number, and associating them with each other List storage means for listing and storing for each area, and mesh calculation means for calculating a mesh management number corresponding to the current position measured by the current position positioning means, wherein the current position is measured by the current position positioning means, and positioning is performed. The mesh management number corresponding to the current position is calculated by the mesh calculation means, and the calculated mesh management number is calculated. The broadcast frequency of the broadcast station corresponding to the broadcast number is extracted by the list storage means, and if the broadcast frequency currently being received by the receiving means is different from the broadcast frequency of the broadcast station corresponding to the calculated mesh management number, the broadcast frequency is corresponded to the mesh management number. The broadcast frequency is changed to the broadcast frequency of the broadcast station, the broadcast frequency at which the traffic information of the current position can be obtained is received, and the received traffic information is displayed together with the road map.
[0014]
According to the present invention, the frequency at which the information related to the position at that time is obtained is preferentially received.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
In this example, the present invention is applied to a navigation device mounted and used on a moving body (here, an automobile), and FIG. 1 shows the entire configuration thereof. This navigation device is used by being mounted on a moving body such as an automobile. However, the navigation device may be configured to be small and portable, for example.
[0017]
Hereinafter, the configuration of the navigation device according to the present embodiment will be described with reference to FIG. 1. A GPS antenna 11 is connected to the navigation device according to the present embodiment, and a signal received by the antenna 11 is transmitted to a GPS signal processing unit. 12 The GPS signal processing unit 12 performs a reception process for a positioning system called GPS (Global Positioning System). That is, it receives GPS positioning signals transmitted from a plurality of positioning artificial satellites, analyzes data included in the signals, and obtains data on the current position (latitude, longitude, altitude). The current position data obtained by the GPS signal processing unit 12 is supplied to the navigation controller 13.
[0018]
The navigation controller 13 is a controller that performs control to display a road map near the measured current position. When positioning data of the position is obtained from the GPS signal processing unit 12, the navigation controller 13 controls the vicinity of the position corresponding to the disk control unit 14. The command to read the road map is sent. The disk control unit 14 controls reading of map data from a CD ROM (here, a map disk on which road map data is recorded) mounted on the CD ROM driver 15. The data is stored in the RAM 16 connected to the controller 13.
[0019]
The road map data stored in the map disk includes, for example, data on the coordinate positions of the start point and end point of each road, and vector data connecting the start point and end point. In addition, auxiliary data necessary for displaying a road map (data of a shape of a building adjacent to a road, data of a road name, a name of a place, and the like) are also stored in the map disk.
[0020]
When the map data read from the map disk having the recorded data is transferred to the RAM 16, the controller 13 draws a road map of a predetermined range in the map data, and outputs image data (display signal). Perform the following processing. Then, the road map data rendered into the predetermined image data is supplied to the video processing unit 17, and the video signal is supplied to the display 18 as a video signal of a predetermined format for display (for example, an RGB signal). Then, the road map is displayed in color. Note that an image display device such as a liquid crystal display panel is used as the display 18, and a display device configured separately from the navigation device may be used.
[0021]
The controller 13 is connected to an operation unit 19 of the navigation device, and displays a road map based on a mode set by operating a key or the like constituting the operation unit 19. For example, the map display range, display scale, and the like can be set by key input.
[0022]
In the present example, when performing a map display or the like configured as described above, a function of receiving information transmitted from the outside and displaying the information on a map is provided. Here, a traffic information transmission system called VICS is applied. To explain this system, the traffic information transmission by VICS is multiplexed with the broadcast wave of the FM broadcast which is a radio broadcast, and relatively wide area road traffic information (congestion information, congestion information, traffic regulation information, etc.) is transmitted in a predetermined manner. In addition to transmitting digitalized data in the form of an optical beacon or radio beacon installed near the road, vehicles (vehicles) that have passed near the beacon by infrared rays or radio waves are relatively Road traffic information in a small area is transmitted.
[0023]
In this case, the traffic information multiplexed on the broadcast wave of the FM broadcast is, in principle, from at least one broadcast station for each prefecture, using the frequency assigned to the broadcast station, and the traffic information for a wide area within the prefecture. Is sent. However, the traffic information on the expressway may be transmitted up to the traffic information on the road beyond the prefecture where the broadcasting station is installed. As traffic information of a relatively small area transmitted by a beacon, for example, traffic information of a road of about 10 km square is transmitted.
[0024]
First, a configuration for receiving traffic information multiplexed on a broadcast wave of an FM broadcast will be described with reference to FIG. 1. An FM tuner 22 to which an FM antenna 21 is connected receives a broadcast wave of a predetermined frequency (channel). And demodulate. Here, the frequency received by the FM tuner 22 is determined by the frequency of the frequency signal supplied from the frequency synthesizer 23. The frequency of the signal output from the frequency synthesizer 23 is set under the control of the FM controller 25.
[0025]
The broadcast wave received and demodulated by the FM tuner 22 is supplied to the FM multiplex decoder 24, and the data modulated on the subcarrier is decoded. The decoder 24 decodes data of a required type under the control of the FM controller 25 and stores the decoded data in the RAM 26 connected to the FM controller 25. Each time new data is received, the RAM 26 Is updated. Here, under the control of the FM controller 25, data relating to traffic information is decoded and stored in the RAM 26.
[0026]
The traffic information stored in the RAM 26 is transmitted to the navigation controller 13 as needed, and the traffic information is reflected on a road map drawn under the control of the navigation controller 13. For example, for a road that is indicated by traffic information indicating that traffic is congested or congested, the display color in the map is changed from that of other roads, and from the displayed map, the corresponding road is congested or congested. Process so that you know that In addition to changing the display color of the road, a traffic congestion section or the like may be directly displayed using characters or the like. Also, when setting a route to a destination, the navigation controller 13 may perform processing to set a route that avoids congestion or congestion based on the received traffic information. Also at the time of setting this route, the set route may be shown on a displayed map.
[0027]
In this example, when setting the receiving frequency of the FM broadcast under the control of the FM controller 25, the frequency-secondary mesh correspondence table as a frequency list prepared in advance in the FM controller 25 and the GPS processing unit 12 An appropriate frequency is set using the data of the measured current position. Although a specific setting example of the frequency will be described later, the FM controller 25 is configured to be supplied with data of the positioning position determined by the navigation controller 13 in order to perform this processing.
[0028]
In the navigation device of this example, a beacon receiving unit 27 is installed, which receives an infrared signal from an optical beacon on a road or a radio wave from a radio beacon, and demodulates the received signal to obtain a traffic signal. The information is supplied from the beacon receiving unit 27 to the navigation controller 13. The traffic information obtained by the beacon receiving unit 27 is also used when drawing a map or setting a route.
[0029]
Here, an example of a state in which the navigation device of the present example is installed in an automobile will be described with reference to FIG. 2. As for the main body of the navigation apparatus main body 10, a predetermined space in the automobile 50 (the lower part of the dashboard). (E.g., in a space or in a trunk), a GPS antenna 11 installed inside or outside the vehicle is connected, and a display 18 that displays a map processed by the navigation device body 10 is displayed on the side of the driver's seat. It is installed on the dashboard where the driver can see. The VICS unit 20 including an FM tuner and an FM controller is connected to the navigation device main body 10, and the FM antenna 21 of the automobile 50 and the beacon receiving unit 27 are connected to the VICS unit 20. Although not shown in FIG. 2, the operation unit 19 may be a remote control device that transmits an operation command to the navigation device main body 10 using, for example, an infrared signal.
[0030]
Next, a process of receiving traffic information multiplexed on FM broadcast waves by the navigation device of the present embodiment will be described. In the case of the VICS system to which the device of this example is applied, a primary mesh in which a range from which traffic information can be obtained is divided, for example, into a range of a square having a side of 80 km is set. The number of the primary mesh to which it belongs is determined by the system. The number of this primary mesh is indicated by, for example, a four-digit number. Then, each primary mesh divided by 80 km is further set to a secondary mesh, for example, divided into a square range with a side of 10 km, and the number of the secondary mesh to which each region belongs is determined by the system. Has been.
[0031]
FIG. 3 is a diagram showing an example of the setting state of the secondary mesh. [00], [01], [02]} and the secondary mesh are included in one primary mesh having a side length of 80 km. The number is set as a two-digit number (FIG. 3 shows only a partial range of one primary mesh). When transmitting traffic information by VICS, a range (area) for providing information is set in units of the primary mesh and the secondary mesh.
[0032]
Here, in the range shown in FIG. 3, there is a prefectural border between the prefecture A and the prefecture B, and in the traffic information transmitted from the FM broadcasting station transmitting the VICS data of the prefecture A, at least the secondary mesh to which the prefecture A belongs is included. Traffic information of the area is transmitted. In the traffic information transmitted from the FM broadcast station transmitting the VICS data of the B prefecture, at least the traffic information of the area of the secondary mesh to which the B prefecture belongs is transmitted. Accordingly, in each of the secondary meshes to which the prefectural border belongs, traffic information is transmitted from both the broadcasting stations in the prefecture A and the broadcasting stations in the prefecture B.
[0033]
Then, the FM controller 25 of the navigation device of the present example has a secondary mesh to which the transmission frequency of the FM broadcasting station transmitting the VICS data of each prefecture and the traffic information indicated by the VICS data transmitted at the transmission frequency belong. Is prepared in advance as storage data of the table. FIG. 4 is a diagram showing an example of this frequency-secondary mesh correspondence table. For each prefecture, the frequency at which the data of the prefecture is transmitted, and the primary mesh and the secondary mesh indicated by the frequency are shown. The number is stored. Here, each mesh number is indicated by a six-digit number, with the first four digits indicating the primary mesh number and the remaining two digits indicating the secondary mesh number.
[0034]
With the above configuration, for example, the processing shown in the flowchart of FIG. 5 is performed as reception frequency control under the control of the FM controller 25. In the processing shown in the flowchart of FIG. 5, when the reception frequency is set by some method and the VICS data is decoded by the FM multiplex decoder 24 at the reception of the frequency, it is necessary to change the reception frequency. This is a process of determining whether or not the above is true. The processing will be described below. The FM controller 25 receives data of the current position measured by the GPS processing unit 12 or the like from the navigation controller 13 as needed (step 101). When the data of the current position is obtained, a process of calculating a mesh number (a primary mesh number and a secondary mesh number) to which the position belongs is performed (step 102). When the mesh number is calculated, the data of the table shown in FIG. 4 prepared in the FM controller 25 is searched (step 103), and the frequency at which the data of the mesh number is obtained is determined (step 104). At this time, in the case of a prefectural border or the like, a plurality of frequencies may exist for one mesh number.
[0035]
After the above processing is performed, it is determined whether the current reception frequency under the control of the FM controller 25 exists in the frequency list corresponding to the mesh number determined from the current position (step 105). Here, if it is determined that the frequency currently being received is present in the frequency list determined from the position, it is determined whether the reception of the current frequency is good enough to correctly decode the VICS data (step 106). When it is determined that the reception has been successfully performed, the reception here is performed with the reception frequency unchanged.
[0036]
If it is determined in step 105 that the frequency currently being received is not present in the frequency list determined from the position, and if it is determined in step 106 that the frequency currently being received cannot be satisfactorily received, the process proceeds to step 104. The frequency indicated by the determined frequency list (if it is determined in step 106 that reception is not possible, a frequency other than the frequency that is determined not to be received) is temporarily set as a reception frequency (step 107). Here, it is determined whether or not the reception frequency that has been temporarily set is good enough to correctly decode the VICS data (step 108). A process for changing the frequency to the set frequency is performed (step 110).
[0037]
If it is determined in step 108 that the signal cannot be satisfactorily received at the temporarily set reception frequency, the reception of the original frequency is reset and the process stands by (step 109). If there are a plurality of frequencies in the frequency list determined in step 104, the reception of the plurality of frequencies is temporarily and sequentially received in steps 107 and 108, and whether reception is good at each frequency is performed. It may be determined whether or not the frequency has been best received in step 110.
[0038]
By performing the process of changing the reception frequency in this manner, even if the reception frequency initially set by any operation or the like is appropriate at the position at that time, the current position is determined by the traveling of the vehicle equipped with the navigation device. Is changed, the receiving frequency suitable for the position is determined from the data of the table which is the frequency list stored in the FM controller 25 which is the receiving control unit of the FM multiplex data, and the determined frequency is satisfactorily received. If possible, the receiving frequency is automatically changed to the frequency determined from the data in the table, and the receiving frequency at which the local information near the position is always obtained is automatically set. Therefore, as long as the vehicle is traveling in the area where the VICS service is provided, road traffic information near the traveling position at that time can be obtained from the data multiplexed in the FM broadcast. Based on traffic information and the like, in a road map near the current position to be displayed on the display 18 of the navigation device, traffic congestion sections, congestion sections, road closure information, and the like are displayed, for example, by changing the color of the roads to be displayed, or by using characters or the like. Can be displayed at all times by switching to the reception of another broadcasting station that can obtain information on the adjacent area as in the past, and traffic information near the current position can be obtained. It can be prevented from disappearing.
[0039]
Further, in the case of this example, as the processing in step 106 of the flowchart of FIG. 5, the deterioration of the reception state of the currently receiving frequency is determined, and when the deterioration of the reception state is determined, the frequency list is also used. Judgment of other frequencies to which the information near the current position is transmitted based on the information of the table of above, and if the determined frequency is different from the frequency currently being received, the reception of the determined frequency is attempted and reception is possible. In this case, by switching to the reception of the frequency, even if the reception state is deteriorated due to a change in the traveling position or the like, there is an effect that the frequency is automatically switched if there is another frequency that can be satisfactorily received. In particular, when there are a plurality of FM broadcasting stations of the same network in the same prefecture (for example, when there is a satellite station), the processing at the time of deterioration of the reception state is performed, so that the vehicle can travel in any position. Even when the user is in charge, the required information can be received and processed satisfactorily.
[0040]
In the example described above, the process of switching the reception frequency to an appropriate one when the position changes due to running after the reception frequency is once set by some operation or the like, but when the reception frequency is set first, Alternatively, the FM controller 25 may determine a reception frequency at which traffic information of the current position measured by the navigation device or the like is obtained, and may be set to receive the frequency. By doing so, there is no need to set a reception frequency to receive traffic information and the like.
[0041]
Further, in the above-described embodiment, the present invention is applied to a case where a road map is displayed by a navigation device mounted on an automobile. However, it is needless to say that the present invention can be applied to a case where information received by a navigation device for another moving object is displayed. is there. In the above-described embodiment, the information to be received is the traffic information multiplexed on the FM broadcast. However, the present invention can be applied to the case of receiving regional information other than the traffic information, and the data transmission can be performed by other various methods. In this case, the present invention can be applied to a case where information on a required area is received.
[0042]
Further, in the above-described embodiment, the data of the table, which is the frequency list for determining the reception frequency, is stored in the FM controller as the reception control unit. However, the data may be prepared in another part. For example, data corresponding to the reception frequency and the primary and secondary meshes may be stored in a disk storing map data, and the storage data may be read from the disk and used by the reception control unit.
[0043]
Further, in the above-described embodiment, the navigation system is a system that performs positioning by GPS. However, it is needless to say that the present invention can be applied to a navigation system that measures the position by another method (for example, autonomous navigation).
[0047]
【The invention's effect】
Of the present inventionAccording to the navigation device, the position corresponding to the position determined by the position determination unittrafficBy judging the frequency at which the information is obtained from the storage information of the frequency list storage unit and controlling the frequency to be received by the signal receiving unit, the frequency at which the information related to the position at that time is obtained is preferentially received, I needtrafficA navigation device that can receive information satisfactorily is obtained.
[0049]
The present inventionAccording to the navigation device, when the reception state of the frequency being received by the signal receiving unit is deteriorated, the current position based on the information of the frequency list is determined.trafficThe frequency control unit determines another frequency at which information is transmitted, and switches the frequency to be received by the signal receiving unit to another frequency. If it gets worse, you need it in that positiontrafficIt automatically switches to the reception of another frequency that can receive information, and always receives the frequency most suitable for the position at that time.
[0050]
The present inventionAccording to the car, it corresponds to the current position determined by the position determination unittrafficBy judging the frequency at which information can be obtained from the information stored in the frequency list storage unit and controlling the frequency received by the signal receiving unit, the frequency at which information related to the traveling position of the vehicle at that time is given priority. Received and needtrafficGood reception of information and that receivedtrafficInformation guidance can be provided.
[0052]
The present inventionAccording to the automobile, when the reception state of the frequency being received by the signal receiving unit is deteriorated, the current position is determined based on the information of the frequency list.trafficThe frequency control unit determines another frequency at which the information is transmitted, and switches the frequency to be received by the signal receiving unit to another frequency. Even if reception condition deteriorates, it is necessary at that positiontrafficIt automatically switches to reception of another frequency that can receive information, and can always receive and guide the frequency most suitable for the position at that time.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram showing a state in which the device according to the embodiment of the present invention is mounted on an automobile.
FIG. 3 is an explanatory diagram illustrating an example of an information providing mesh.
FIG. 4 is an explanatory diagram illustrating an example of a correspondence table between a frequency and an information providing mesh.
FIG. 5 is a flowchart showing a frequency changing process according to the embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 navigation device main unit, 12 GPS signal processing unit, 13 navigation controller, 14 disk control unit, 15 CD ROM driver, 16RAM, 17 video processing unit, 18 display, 19 operation unit, 20 VICS unit, 22 FM tuner, 23 frequency synthesizer , 24 FM multiplex decoder, 25 FM controller, 26 RAM, 27 beacon receiver, 50 automobile

Claims (4)

In a navigation device that receives traffic information transmitted at a predetermined broadcast frequency and displays the traffic information together with a road map,
Current position positioning means for positioning the current position;
Receiving means for receiving traffic information transmitted at a predetermined broadcast frequency,
List storage means for dividing the broadcast frequency of each broadcast station and the range of the area of each traffic information provided by each broadcast station into meshes and assigning a mesh management number, associating each with a list for each area, and storing the list;
Mesh calculating means for calculating the mesh management number corresponding to the current position measured by the current position positioning means,
The current position is measured by the current position positioning means, a mesh management number corresponding to the measured current position is calculated by the mesh calculation means, and a broadcast frequency of a broadcasting station corresponding to the calculated mesh management number is calculated by the list storage means. Extract, if the broadcast frequency currently being received by the receiving means is different from the broadcast frequency of the broadcast station corresponding to the calculated mesh control number, change to the broadcast frequency of the broadcast station corresponding to the mesh control number, A navigation device which receives a broadcast frequency at which traffic information of a current position can be obtained and displays the received traffic information together with a road map. The navigation device according to claim 1 ,
When there are a plurality of broadcast frequencies of the broadcast station corresponding to the mesh management number corresponding to the current position, the plurality of broadcast frequencies are sequentially received and the broadcast frequency is changed to a broadcast frequency that can be received best. Navigation device. In a vehicle having a navigation function of receiving traffic information transmitted at a predetermined broadcast frequency and displaying the traffic information together with a road map,
Current position positioning means for positioning the current position;
Receiving means for receiving traffic information transmitted at a predetermined broadcast frequency,
List storage means for dividing the broadcast frequency of each broadcast station and the range of the area of traffic information provided by each broadcast station into meshes, assigning a mesh management number, associating each with a list for each area, and storing the list;
Mesh calculating means for calculating the mesh management number corresponding to the current position measured by the current position positioning means,
The current position is measured by the current position positioning means, a mesh management number corresponding to the measured current position is calculated by the mesh calculation means, and a broadcast frequency of a broadcasting station corresponding to the calculated mesh management number is calculated by the list storage means. Extract, if the broadcast frequency currently being received by the receiving means is different from the broadcast frequency of the broadcast station corresponding to the calculated mesh control number, change to the broadcast frequency of the broadcast station corresponding to the mesh control number, An automobile which receives a broadcast frequency at which traffic information of a current position can be obtained and displays the received traffic information together with a road map . The vehicle according to claim 3 ,
In the case where there are a plurality of broadcast frequencies of the broadcast station corresponding to the mesh management number corresponding to the current position, a receiver for receiving the plurality of broadcast frequencies in order and changing the broadcast frequency to the broadcast frequency that can be best received was provided. An automobile characterized by that:

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