JP5145107B2 - Navigation device, map distribution system - Google Patents

Description

  The present invention relates to a vehicle navigation device and a map distribution system for distributing data to the navigation device.

  Conventionally, a navigation device that partially updates map data by setting an update target area for map data and downloading the latest map data by wireless communication for the update target area is known. Among such navigation devices, there is one that displays the range of the update target area on a map (see Patent Document 1).

JP 2006-145332 A

  By the way, when a road that passes through the update target area is newly opened, and when the map data is updated by adding the road, map data not only for the update target area but also for the surrounding area through which the road passes. Need to be updated. In such a case, the navigation device disclosed in Patent Document 1 cannot appropriately indicate the area where the map data is updated on the map.

A navigation apparatus according to the present invention includes a map recording unit that records map data representing a map divided into a plurality of sections in units of a predetermined distance, and a map display control that displays a map on a display monitor based on the map data. The update target area in which the specified map to which the point specified by the user belongs and the block adjacent to the specified map are to be acquired for the update map data used for updating the map data among the plurality of map data blocks And a graphic display control means for displaying a graphic indicating the update target area set by the setting means in a superimposed manner on the map, and the setting means includes the designated section as an upper left area, an upper right area, and a lower left area. When the point specified by the user is in the upper left area, it is divided into four areas, the area and the lower right area. When the area adjacent to both of the two areas is set as the update target area and the point specified by the user is in the upper right area, the specified area and the upper and right sides of the specified area are 2 adjacent to each other. If two sections and a section adjacent to both of the two sections are set as update target areas and the point specified by the user is in the lower left area, the designated section and the lower and left sides of the designated section Two adjacent sections and a section adjacent to both of the two sections are set as update target areas, and when the point designated by the user is in the lower right area, the designated section and the designated section Two sections adjacent to the lower side and the right side, and a section adjacent to both of the two sections are set as update target areas, and the graphic display control means displays the peripheral part of the graphic in a translucent manner. that is, wheel of figure And displays blurred.

  According to the present invention, an area where map data is updated can be appropriately shown on a map.

  A configuration of a navigation system according to an embodiment of the present invention is shown in FIG. This system includes a navigation device 1 and a communication terminal 2 mounted on a vehicle 100, a communication network 3, and a distribution server 4. The navigation device 1 and the communication terminal 2 are connected by wired or wireless connection.

  The navigation device 1 detects the position of the vehicle 100, displays a map, and indicates the detected position of the vehicle 100 on the map. When the destination of the vehicle 100 is set by the user, the recommended route to the destination is searched, and the vehicle 100 is guided to the destination according to the searched recommended route. The navigation device 1 stores map data used for executing such processing.

  The map data stored in the navigation device 1 can be partially updated. When updating the map data, the navigation device 1 acquires the difference between the current map data and the latest map data for the set update target area as updated map data. The updated map data can be downloaded from the distribution server 4 to the navigation device 1 via the communication terminal 2 and the communication line network 3. Alternatively, the updated map data recorded in the DVD 5 or USB (Universal Serial Bus) memory 6 may be read by the navigation device 1. In addition, the specific processing content of the navigation apparatus 1 at the time of update of map data is demonstrated in detail later.

  The communication terminal 2 performs wireless connection with the communication line network 3 as necessary under the control of the navigation device 1. A distribution server 4 is connected to the communication line network 3. That is, the navigation device 1 is connected to the distribution server 4 via the communication terminal 2 and the communication line network 3. When the communication terminal 2 and the communication line network 3 are wirelessly connected, a radio base station (not shown) included in the communication line network 3 is used. The wireless base stations can wirelessly communicate with the communication terminals 2 in a predetermined communication area around the wireless base stations, and are scattered throughout the country. The communication terminal 2 is a mobile phone, for example. The communication network 3 is constructed by, for example, a mobile phone network or the Internet.

  The distribution server 4 stores the latest map data in various parts of the country. When there is a distribution map data distribution request from the navigation device 1 via the communication terminal 2 and the communication line network 3, the distribution server 4 updates the update target area set in the navigation device 1 in response to the distribution request. Distribute map data. The updated map data distributed from the distribution server 4 in this way is transmitted to the communication terminal 2 via the communication network 3 and is output from the communication terminal 2 to the navigation device 1. Thereby, the update map data is downloaded in the navigation device 1.

  Both the DVD 5 and the USB memory 6 are recording media on which updated map data is recorded. When one of the DVD 5 and the USB memory 6 is set by the user, the navigation device 1 can read the updated map data therefrom. In the DVD 5 and the USB memory 6, for example, updated map data downloaded by a user using a personal computer (not shown) is recorded. In this case, the DVD 5 is a recordable DVD such as a DVD-R. Alternatively, the manufacturer of the navigation device 1 or the like may distribute the DVD 5 or USB memory 6 to users by mail or the like. In this case, the DVD 5 may not be a recordable DVD. Instead of the DVD 5 and the USB memory 6, other types of recording media such as a CD and a memory card may be used.

  Next, the configuration of the navigation device 1 will be described. FIG. 2 is a block diagram showing the configuration of the navigation device 1. As shown in FIG. 2, the navigation device 1 includes a control unit 10, a vibration gyro 11, a vehicle speed sensor 12, a hard disk (HDD) 13, a disk drive 14, a USB interface (I / F) 15, and a GPS (Global Positioning System) reception. Unit 16, display monitor 17, and input device 18.

  The control unit 10 includes a microprocessor, various peripheral circuits, a RAM, a ROM, and the like, and executes various processes based on a control program and map data recorded in the HDD 13. Various processes for guiding the host vehicle, that is, the vehicle 100 to the destination are executed by the control unit 10. For example, a destination search process when setting a destination, a recommended route search process to the set destination, a current position detection process of the vehicle 100, various image display processes, and a voice output process during route guidance Etc. are executed. A communication terminal 2 is connected to the control unit 10, and the control unit 10 controls the communication terminal 2, whereby a distribution map data distribution request is made from the navigation device 1 to the distribution server 4 of FIG. 1. The updated map data distributed from the distribution server 4 in response to this distribution request is output to the control unit 10 via the communication terminal 2.

  The vibration gyro 11 is a sensor for detecting the angular velocity of the vehicle 100. The vehicle speed sensor 12 is a sensor for detecting the vehicle speed of the vehicle 100. Based on the detection results of these sensors, the control unit 10 calculates the movement state of the vehicle 100 at predetermined time intervals, thereby obtaining the amount of movement of the vehicle 100, thereby detecting the current position of the vehicle 100. The

  The HDD 13 is a non-volatile recording medium that can rewrite recorded information. In the HDD 13, information such as a control program and map data for executing the processing as described above in the control unit 10 is recorded. In the map data recorded in the HDD 13, the map is divided into a plurality of sections in a predetermined distance unit. Each of these compartments is called a mesh. That is, in the navigation device 1, map data is managed in units of meshes.

  Further, in the map data recorded in the HDD 13, each road is represented by being divided into predetermined road sections. Each of these road sections is called a link. That is, in the map data, each road is composed of a plurality of links. Each of the links is set with a value called a link cost related to the time required for the vehicle to pass. The point connecting the links is called a node. Each of the nodes has position information expressed using map coordinates. Based on the position information of this node, the position and shape of each road represented on the map are determined.

  The map data recorded in the HDD 13 can be updated with respect to the set update target area by updated map data distributed from the distribution server 4 or updated map data read from the DVD 5 or the USB memory 6. For example, when a new road is opened in the update target area or when a new facility is installed, information on the road and facility is provided as updated map data. Based on the updated map data, the map data recorded in the HDD 13 is added or a part of the map data is rewritten. In this way, the difference between the map data recorded in the HDD 13 and the latest map data is complemented, and the map data is updated. The update target area is set in units of meshes as described above.

  If a newly opened road passes through the update target area and reaches another area, the information of the road in the update map data is not only the part in the update target area but also the point connected to the other road. Provided. That is, information up to a point where connection with an existing road is guaranteed is provided as updated map data. As a result, roads added in the updated map data are prevented from being interrupted in the middle or from inconsistencies with existing roads.

  The range of the update target area to be set differs between when the update map data is distributed from the distribution server 4 and when the update map data is read from the DVD 5 or the USB memory 6. For example, when the updated map data is distributed from the distribution server 4, in order to reduce the cost and time of wireless communication by the communication terminal 2, a mesh included in a range within a predetermined distance from the point specified by the user is defined as the update target area. Is done. On the other hand, when the update map data is read from the DVD 5 or the USB memory 6, when the user downloads the update map data using a personal computer, the mesh of the update target area is set by the user in units of prefectures. That is, all meshes that overlap with the prefecture designated by the user in whole or in part are set as update target areas. Further, in this case, information other than roads and facilities in the update target area, for example, information on a new icon can be included in the update map data.

  Although the example in which the map data is recorded on the HDD 13 in the navigation device 1 has been described above, any recording medium other than the HDD may be used as long as it is a rewritable recording medium. For example, a flash memory or the like may be used instead of the HDD.

  The disk drive 14 is a part for reading updated map data recorded on the DVD 5, and has a disk drive mechanism, a pickup mechanism, and the like. When the DVD 5 is set in the disk drive 14, the updated map data recorded on the DVD 5 is read by the disk drive 14 and output to the control unit 10. As a result, the updated map data is read from the DVD 5 in the navigation device 1.

  The USB interface 15 has a slot portion for loading the USB memory 6. When the USB memory 6 is loaded in this slot part, the updated map data recorded in the USB memory 6 is read out by the USB interface 15, subjected to predetermined interface processing, and then output to the control part 10. . As a result, the updated map data is read from the USB memory 6 in the navigation device 1.

  The GPS receiver 16 receives a GPS signal transmitted from a GPS satellite and outputs it to the controller 10. The GPS signal includes information on the position and transmission time of the GPS satellite that transmitted the GPS signal as information for obtaining the position of the vehicle 100 and the current time. Therefore, by receiving GPS signals from a predetermined number or more of GPS satellites, the current position and current time of the vehicle 100 can be calculated based on these pieces of information. Based on the current position of the vehicle 100 calculated based on the GPS signal received by the GPS receiver 16 and the current position of the vehicle 100 calculated based on the detection results of the vibration gyro 11 and the vehicle speed sensor 12 described above. Thus, the final current position of the vehicle 100 is obtained.

  The display monitor 17 is a device for displaying various screens in the navigation device 1 and is configured using a liquid crystal display or the like. The display monitor 17 displays a map screen. The contents of the screen displayed on the display monitor 17 are determined by screen display control performed by the control unit 10. The display monitor 17 is installed at a position where the user can easily see, for example, on the dashboard of the vehicle 100 or in the instrument panel.

  The input device 18 is a device for a user to perform various input operations for operating the navigation device 1 and includes various input switches. The user operates the input device 18 to input, for example, the name of a facility or point desired to be set as a destination, select a destination from registered locations registered in advance, or display a map in an arbitrary direction. Or scroll. The input device 18 can be realized by an operation panel, a remote controller, or the like. Alternatively, the input device 18 may be realized by a touch panel integrated with the display monitor 17.

  When the user operates the input device 18 to set the destination, the navigation device 1 searches for a route to the destination where the total of the link costs is minimized based on the link cost set in the map data, for example. The route is set as a recommended route. The recommended route set in this way is displayed on the map in a display form distinguishable from other roads. Thereafter, the navigation device 1 displays a map around the current location, and guides the vehicle 100 to the destination according to the set recommended route.

  Next, the processing content when the navigation apparatus 1 updates map data is demonstrated. FIG. 3 is a flowchart of processing executed in the control unit 10 of the navigation device 1 when the map data is updated. Hereinafter, processing contents will be described according to this flowchart.

  In step S10, the control unit 10 determines whether or not to start updating the map data. When the update of the map data is instructed by the user's operation, or when the DVD 5 or the USB memory 6 in which the updated map data is recorded is set, the control unit 10 determines that the update of the map data is started, and step S20 Proceed to

  In step S20, the control unit 10 determines an acquisition destination of the updated map data. When the communication terminal 2 is connected to the navigation device 1 and the user designates the distribution server 4 as the acquisition destination of the updated map data, the control unit 10 proceeds to step S30. On the other hand, when the DVD 5 or USB memory 6 is set in the navigation device 1 and the user designates the set DVD 5 or USB memory 6 as the acquisition destination of the updated map data, the control unit 10 proceeds to step S130.

  In step S30, the control unit 10 sets a point designated by the user as a representative point for setting the update target area. At this time, various methods can be used as the representative point designation method. For example, any point designated on the map displayed on the display monitor 17 by the user may be set as the representative point, or a point corresponding to the address designated by the user may be set as the representative point. Further, the representative point may be determined based on the current position of the vehicle 100 or the position of the registered location registered in advance by the user. When the representative point is set in this way, the control unit 10 proceeds to step S40.

  In step S40, the control unit 10 displays a map around the representative point set in step S30 on the display monitor 17 at a predetermined map scale based on the map data recorded in the HDD 13. At this time, in order to make it easy for the user to grasp the position of the representative point and the area mark displayed in step S60 described later on the map, the map is displayed so that a predetermined direction, for example, north is facing upward. In addition, when the map is already displayed in order to set a representative point in step S30, it is not necessary to display a map anew in step S40.

  In step S50, the control unit 10 sets a map data update target area. Here, an area including the mesh to which the representative point set in step S30 belongs and at least one of the meshes adjacent to the mesh is set as the update target area. At this time, based on the position of the representative point in the mesh to which the representative point belongs, it is determined which of the adjacent meshes is set as the update target area. The specific method will be described below using the example of FIG.

  FIG. 4 shows meshes 21 to 29 set for the map data. Among the meshes 21 to 29, it is assumed that a representative point is set in the mesh 25 according to the user's designation. In this case, the mesh set as the update target area is changed as follows depending on which of the areas 25a, 25b, 25c, and 25d in which the mesh 25 is divided into four areas is present. The

  For example, it is assumed that a representative point is set in a region 25a located in the upper left in the mesh 25. In this case, four meshes are set as update target areas on the upper left side from the mesh 25. That is, the mesh 25, the mesh 22 and the mesh 24 adjacent to the upper side and the left side of the mesh 25, and the mesh 21 adjacent to the mesh 22 and the mesh 24 are set as the update target area.

  Further, when the representative point is set in the area 25b located at the upper right in the mesh 25, four meshes are set as the update target area from the mesh 25 to the upper right side. That is, the mesh 25, the mesh 22 and the mesh 26 adjacent to the upper side and the right side of the mesh 25, and the mesh 23 adjacent to the mesh 22 and the mesh 26 are set as update target areas.

  Similarly, when a representative point is set in the area 25c located at the lower left in the mesh 25, four meshes are set as update target areas on the lower left side from the mesh 25. That is, the mesh 25, the mesh 24 and the mesh 28 adjacent to the left and lower sides of the mesh 25, and the mesh 27 adjacent to the mesh 24 and the mesh 28 are set as the update target area.

  Furthermore, when a representative point is set in the area 25d located in the lower right of the mesh 25, four meshes are set as update target areas on the lower right side from the mesh 25. That is, the mesh 25, the mesh 26 and the mesh 28 adjacent to the right side and the lower side of the mesh 25, and the mesh 29 and the mesh 29 adjacent to the mesh 28 are set as update target areas.

  In step S50, the update target area is set as described above. When the update target area is thus set, the control unit 10 proceeds to step S60.

  In step S60, the control unit 10 displays the graphic indicating the update target area set in step S50 on the map displayed in step S40 as an area mark for the update target area.

  In step S <b> 70, the control unit 10 determines whether or not there has been an instruction to change the scale from the user. When there is an instruction to change the scale, the control unit 10 proceeds to step S80, and in step S80, the scale of the map displayed in step S40 is changed according to the instruction. If step S80 is performed, the control part 10 will progress to step S90. On the other hand, if there is no instruction to change the scale in step S70, the process proceeds to step S90 without executing step S80.

  Note that when the map scale is changed in step S80, the control unit 10 changes the map scale that can be changed so that the area mark displayed in step S60 is displayed in an appropriate size on the map. Limit the range to a range narrower than usual. For example, it is assumed that the scale can be changed in a range of 50 m scale (equivalent to 1 / 5,000) to 256 km scale (equivalent to 1 / 2048,000) during normal map display. On the other hand, in step S80, for example, the map scale that can be changed to a range of 1 km scale (equivalent to 1 / 80,000) to 4 km scale (equivalent to 1/320000) is limited.

  FIG. 5 shows how the map scale is changed in step S80. In the screen of FIG. 5A, an area mark 30 is displayed on the map. By changing the scale of the map to the wide area side from here, a screen as shown in FIG. 5B is displayed. In this screen, the area mark 30 changes slightly according to the change in the map scale. Further, by changing the map scale to the wide area side, a screen as shown in FIG. 5C is displayed. In this screen, the area mark 30 is further reduced in accordance with the change of the map scale.

  In the screen examples of FIGS. 5A to 5C, the area mark 30 is a circle centered on the representative point. That is, in step S60, a circle centered on the point designated by the user as the representative point in step S30 is displayed as an area mark 30 on the map.

  The size of the area mark 30 on the map is determined according to the size of the update target area. That is, the size of the area mark 30 is determined so that a range that substantially matches the update target area overlaps the area mark 30.

  As shown in the screen examples of FIGS. 5A to 5C, when the area mark 30 is displayed on the map, the control unit 10 blurs the outline and displays the boundary of the update target area. Avoid standing up. As a result, as described above, the newly opened road passes through the update target area and reaches another area, so even if the map data is updated to that area, the map data is updated. Area can be shown appropriately on the map.

  In step S <b> 90, the control unit 10 determines whether there is an instruction to confirm the update target area from the user. If there is a confirmation instruction, the control unit 10 proceeds to step S100. On the other hand, if there is no confirmation instruction, the process returns to step S30 to execute the processing as described above to reset the update target area.

  In step S <b> 100, the control unit 10 transmits an update map data distribution request for the update target area to the communication terminal 2. This distribution request includes information regarding the contents of the map data recorded in the HDD 13 in the update target area. For example, information indicating the mesh number for specifying the mesh set in the update target area and the version of the map data in the mesh is transmitted as the distribution request.

  The distribution request transmitted from the control unit 10 to the communication terminal 2 in step S100 is transmitted from the communication terminal 2 to the distribution server 4 via the communication line network 3 by wireless communication performed by the communication terminal 2. Then, the distribution server 4 generates updated map data to be transmitted to the navigation device 1 based on the information described above included in the transmitted distribution request, and transmits it to the communication terminal 2 via the communication line network 3. To do.

  In step S110, the control unit 10 receives updated map data transmitted from the distribution server 4 to the communication terminal 2 from the communication terminal 2 in response to the distribution request transmitted in step S100. Thereby, the update map data for the update target area is distributed from the distribution server 4 to the navigation device 1.

  In step S120, the control unit 10 updates the map data recorded in the HDD 13 based on the updated map data received in step S110. If step S120 is performed, the control part 10 will complete | finish the flowchart of FIG.

  On the other hand, when it is determined in step S20 that the update map data is acquired from the DVD 5 or the USB memory 6, the control unit 10 reads the update map data recorded from the DVD 5 or the USB memory 6 in step S130. In the next step S140, the control unit 10 updates the map data recorded in the HDD 13 based on the updated map data read in step S130. If step S140 is performed, the control part 10 will complete | finish the flowchart of FIG.

According to the embodiment described above, the following operational effects are obtained.
(1) The navigation device 1 displays a map on the display monitor 17 based on the map data recorded in the HDD 13 by the processing of the control unit 10 (step S40), and sets a map data update target area ( In step S50), a graphic indicating the set update target area is displayed as an area mark on the map (step S60). At this time, the outline of the graphic displayed as the area mark is blurred. Since it did in this way, the area where map data is updated can be shown appropriately on a map.

(2) In step S60, the control unit 10 displays a circle centered on the representative point designated by the user in step S30 on the map as an area mark. Since it did in this way, the area where map data is updated can be shown on a map in an easy-to-understand manner.

(3) In the map data recorded in the HDD 13, the map is divided into a plurality of meshes in a predetermined distance unit. In step S50, the control unit 10 sets, as the update target area, an area including a mesh to which the representative point designated by the user belongs and at least one of the meshes adjacent to the mesh among the plurality of meshes. Set. Since it did in this way, an update object area can be set appropriately according to a user's specification.

(4) More specifically, in step S50, the control unit 10 determines which mesh among the meshes adjacent to the mesh based on the position of the representative point in the mesh to which the representative point designated by the user belongs. Decide whether to set as the update target area. Since it did in this way, the adjacent mesh set to an update object area can be determined exactly.

(5) The navigation device 1 changes the scale of the map within a predetermined range according to the user's instruction by the processing of the control unit 10. At this time, if the area mark is displayed on the map in step S60, the scale of the map that can be changed is limited to a range narrower than the original range (step S80). Since it did in this way, even if the scale of a map is changed, an area mark can be displayed on a map with an appropriate size.

(6) In step S40, the control unit 10 displays the map so that the predetermined direction is upward. Thereby, when the area mark is displayed on the map in step S60, the map is displayed so that the direction is upward. Since it did in this way, it can make it easy for a user to grasp | ascertain on the map the representative point set by step S30, and the position of the area mark displayed by step S60.

(7) The navigation system shown in FIG. 1 includes a navigation device 1, a communication terminal 2, and a distribution server 4. In this navigation system, the communication terminal 2 transmits information regarding the contents of the map data in the update target area set in the navigation device 1 as a distribution request by wireless communication. Further, the distribution server 4 distributes the update map data for the update target area toward the navigation device 1 based on the distribution request transmitted by the communication terminal 2. Since it did in this way, update map data can be delivered to the navigation apparatus 1 with the correct content.

  In the embodiment described above, the map data of the navigation device 1 is updated by providing the navigation device 1 with the difference between the current map data and the latest map data for the update target area using the updated map data. An example was explained. However, instead of doing this, the map data of the navigation device 1 is supplied by using the updated map data and partially rewriting the map data using this updated map data. You may make it update.

  The embodiments and modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. Moreover, you may use the said embodiment and a modification in combination.

1 is a configuration diagram of a navigation system according to an embodiment of the present invention. It is a block diagram which shows the structure of a navigation apparatus. It is a flowchart of the process performed at the time of update of map data. It is a figure for demonstrating the determination method of the mesh set to an update object area. It is a figure which shows a mode that the reduced scale of a map is changed.

Explanation of symbols

1: navigation device, 2: communication terminal, 3: communication network, 4: distribution server,
5: DVD, 6: USB memory, 10: control unit, 11: vibration gyro,
12: Vehicle speed sensor, 13: HDD, 14: Disk drive,
15: USB interface, 16: GPS receiver, 17: display monitor,
18: input device, 100: vehicle

Claims (5)

Map recording means in which map data representing a map divided into a plurality of sections in a predetermined distance unit is recorded;
A map display control means for displaying the map on the display monitor based on the map data,
Of the plurality of sections of the map data, the update target area to which the specified section to which the point specified by the user belongs and the section adjacent to the specified section are to be acquired for the update map data used for updating the map data Setting means to set as ,
Graphic display control means for displaying a graphic indicating the update target area set by the setting means on the map,
The setting means includes
The designated section is divided into four areas, an upper left area, an upper right area, a lower left area, and a lower right area,
When the point designated by the user is in the upper left area, the designated section, two sections adjacent to the upper and left sides of the specified section, and a section adjacent to both of the two sections, Set as the update target area,
When the point designated by the user is in the upper right area, the designated section, two sections adjacent to the upper side and the right side of the specified section, and a section adjacent to both of the two sections, Set as the update target area,
When the point designated by the user is in the lower left area, the designated section, two sections adjacent to the lower side and the left side of the specified section, and a section adjacent to both of the two sections, , Set as the update target area,
When the point designated by the user is in the lower right area, the designated section, two sections adjacent to the lower side and the right side of the specified section, and a section adjacent to both of the two sections, Is set as the update target area,
The graphic display control means displays a peripheral portion of the graphic in a translucent manner, thereby blurring and displaying the outline of the graphic. The navigation device according to claim 1, wherein
The graphic display control means, a navigation system and displaying the circle around the point specified in the user on said map as the graphic. The navigation device according to claim 1 or 2 ,
A scale change unit for changing the scale of the map in a predetermined range in accordance with an instruction of the user,
When the graphic is displayed on the map by the graphic display control means, the range of the scale of the map that can be changed by the scale changing means is displayed on the map by the graphic display control means. A navigation device , further comprising: a scale limiting means for limiting the range to a range narrower than a range of the scale of the map that can be selected by the scale changing means . In the navigation device according to any one of claims 1 to 3 ,
The navigation apparatus, wherein when the figure is displayed on the map by the figure display control means, the map display control means displays the map so that a predetermined direction is upward. The navigation device according to any one of claims 1 to 4 ,
A wireless communication device for transmitting information related to the contents of the map data in the update target area by wireless communication;
A map distribution system comprising: a distribution device that distributes updated map data for the update target area to the navigation device based on information transmitted by the wireless communication device.

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