JP4969700B2 - Map display device - Google Patents

Description

  The present invention relates to a map display device that is mounted on a vehicle and displays a map around its own vehicle position, and more particularly to a technique for controlling whether map display is possible depending on the area where the vehicle is present.

  When using a map display device that reads map data from a storage medium and displays the map, there is an area that needs to pay attention to the handling of the map data stored in the map display device. For example, the use of map data stored in a map display device outside a country is prohibited in a certain country. When a vehicle equipped with a map display device moves outside the country, a map display using the map data in the country is used. It is necessary to ban.

  In order to deal with an area where attention should be paid to the handling of such a map, Patent Document 1 discloses that a map display device is used outside a specific area in a state where map data of the specific area can be read out. A map display device that can prevent the above is disclosed. This map display device checks whether or not the current position is near the boundary of the specific area, and determines whether or not to disable reading of the map data stored in the storage device if it is determined that the current position is near the boundary. When a confirmation screen for confirming to the user is displayed and it is permitted to disable the reading of the map data by the user's operation, a process of disabling the reading of the map data from the storage device is performed. Thereby, the map display of a specific area can be locked near the border so that the map data is not used outside the country in a state where the map can be displayed without the user's knowledge.

JP 2009-53222 A

  By the way, as in the map display device disclosed in Patent Document 1 described above, when the vehicle travels outside the specific area while the map display of the specific area is locked, the display in the specific area becomes blank and the usability is very bad. There is a problem.

  The present invention has been made in order to solve the above-described problems, and its object is to provide a map display device capable of displaying a specific area that requires attention to the handling of the map without a sense of incongruity. is there.

  A map display device according to the present invention includes a current position calculation unit that calculates a current position, a database dedicated to a specific area that stores map data that is permitted to be used only within a specific area, and a specific area outside the specific area. A specific area use permission database that stores data that is permitted to be displayed, a non-specific area database that stores map data outside the specific area that can be used both inside and outside the specific area, and a current position calculation unit If the calculated current position is outside the specific area, display data that displays the map outside the specific area is generated using the map data acquired from the specific area database, and the data acquired from the specific area use permission database is used. Display data to display images of map attributes allowed within a specific area, and the current position calculated by the current position calculator If the location is within a specific area, display data that displays the map outside the specific area is generated using the map data acquired from the specific area database and the map data acquired from the specific area database is used to generate the display data. A control unit that generates display data for displaying a map, and a display unit that displays a map or an image of an allowed map attribute based on the display data generated by the control unit.

  According to the map display device of the present invention, when a map that is permitted to be displayed only in a specific area is displayed in the specific area, the map is displayed as it is and a map in the specific area is displayed outside the specific area. In this case, since the image having the permitted map attribute is displayed, it is possible to display the specific area where it is necessary to pay attention to the handling of the map without a sense of incongruity.

It is a block diagram which shows the structure of the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the map attribute used in the map display apparatus which concerns on Embodiment 1 of this invention. In the map display apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the example of a map display when the own vehicle exists in a specific area. In the map display apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the example of a map display in case the own vehicle exists outside a specific area compared with the conventional map display. It is a flowchart which shows operation | movement of the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which compares and shows the map display in the map display apparatus which concerns on Embodiment 1 of this invention with the conventional map display. It is a block diagram which shows the structure of the map display apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the map display apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the example of the map attribute used in the map display apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the image of the map displayed with the map display apparatus which concerns on Embodiment 4 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a map display device according to Embodiment 1 of the present invention. This map display device includes a CPU (Central Processing Unit) 10, a built-in memory 11, a GPS (Global Positioning System) receiver 12, a vehicle speed sensor 13, an orientation sensor 14, a touch panel 15, a radio receiver 16, and an HDD (Hard Disk Drive). 17, a CD (Compact Disc) / DVD (Digital Versatile Disk) drive 18, an encryption chip 19, a mobile phone 20, a drawing chip 21, a liquid crystal monitor 22, an amplifier 23, and a speaker 24.

  The CPU 10 corresponds to the control unit of the present invention, and includes a built-in memory 11, a GPS receiver 12, a vehicle speed sensor 13, a direction sensor 14, a touch panel 15, a radio receiver 16, an HDD 17, a CD / DVD drive 18, an encryption chip 19, The entire map display device is controlled by executing predetermined processing while transmitting / receiving data to / from the mobile phone 20, the drawing chip 21 or the amplifier 23. Details of the processing executed by the CPU 10 will be described later.

  The built-in memory 11 is composed of, for example, a RAM (Random Access Memory). In the internal memory 11, a program D5 (details will be described later) read from the HDD 17 is expanded. The CPU 10 operates according to the program D5 expanded in the built-in memory 11. The built-in memory 11 is used for temporarily storing data being processed by the CPU 10.

  The GPS receiver 12 detects the current position of the vehicle on which the map display device is mounted based on a GPS signal obtained by receiving a radio wave transmitted from a GPS satellite with an antenna (not shown). Current position data representing the current position of the vehicle detected by the GPS receiver 12 is sent to the CPU 10.

  The vehicle speed sensor 13 detects the moving speed of the vehicle based on the vehicle speed pulse sent from the vehicle on which the map display device is mounted. Speed data representing the moving speed of the vehicle detected by the vehicle speed sensor 13 is sent to the CPU 10. The direction sensor 14 detects the traveling direction of the vehicle on which this map display device is mounted. Direction data representing the traveling direction of the vehicle detected by the direction sensor 14 is sent to the CPU 10.

  The CPU 10 that has received the speed data from the vehicle speed sensor 13 and the direction data from the direction sensor 14 detects the current position of the vehicle by self-contained navigation based on the speed data and the direction data, and generates current position data. Thus, even if the current position of the vehicle cannot be detected by the GPS receiver 12 due to, for example, entering a valley of a tunnel or a building, the current position of the vehicle can be detected by self-contained navigation. Can do.

  The touch panel 15 is placed on the screen of the liquid crystal monitor 22 and is used for inputting various instructions to the map display device. The touch panel 15 generates a signal corresponding to the touched position and sends it to the CPU 10 as operation data. In response to the operation data, the CPU 10 executes processing for realizing, for example, changing the display mode of the liquid crystal monitor 22, scrolling the screen, searching for facilities, searching for routes, or guiding guidance. A remote controller (remote controller), a hard switch, a voice recognition device, or the like can be used instead of or in combination with the touch panel 15.

  The radio receiver 16 receives a radio broadcast, reproduces an audio signal, and sends it to the CPU 10. The CPU 10 sends the audio signal sent from the radio receiver 16 to the amplifier 23 as audio data. As a result, radio broadcast sound is output from the speaker 24, as will be described later.

  The HDD 17 stores specific area boundary data D1, a specific area dedicated database D2, a specific area use permission database D3, a specific area outside database D4, and a program D5. The specific area boundary data D1 is data representing a boundary (for example, a border) between the specific area and the outside of the specific area. The specific area dedicated database D2 stores map data that is permitted to be used only in the specific area. Here, the “specific area” refers to a country or area where the use of the map is restricted.

  The specific area use permission database D3 stores data in a specific area that can be used outside the specific area, for example, data of photographs taken from satellites (hereinafter referred to as “satellite photographs”). Here, “outside a specific area” refers to a country or area where the use of the map is not restricted. The non-specific area database D4 stores map data outside the specific area that can be used both inside and outside the specific area. As described above, the program D5 is data describing a procedure for operating the map display device. Various data stored in the HDD 17 is read by the CPU 10.

  The CD / DVD drive 18 reproduces information recorded on the mounted CD or DVD 18a. The audio signal and video signal obtained by the reproduction in the CD / DVD drive 18 are sent to the CPU 10. The CPU 10 sends the video signal sent from the CD / DVD drive 18 to the drawing chip 21 and sends the audio signal to the amplifier 23. As a result, as will be described later, an image is displayed on the liquid crystal monitor 22 and a sound is output from the speaker 24.

  The encryption chip 19 encrypts or decrypts data sent from the CPU 10 and returns it to the CPU 10. The encryption chip 19 encrypts map data that is permitted to be used only within a specific area and stores it in the specific area dedicated database D2 of the HDD 17 or the encryption read out from the specific area dedicated database D2 of the HDD 17. It is used to decrypt the map data that has been processed.

  The mobile phone 20 is used to control communication between the map display device and the outside. In other words, the mobile phone 20 receives a radio wave transmitted from the outside and converts it into an electrical signal, sends it to the CPU 10 as a received signal, and converts a transmission signal sent from the CPU 10 into a radio wave and transmits it to the outside. . This mobile phone 20 is used, for example, for acquiring various information from an external server.

  The drawing chip 21 corresponds to a part of the display unit of the present invention, draws an image based on the display data sent from the CPU 10, and sends it to the liquid crystal monitor 22 as a video signal. The liquid crystal monitor 22 corresponds to the other part of the display unit of the present invention, and displays an image based on the video signal sent from the drawing chip 21.

  The amplifier 23 generates and amplifies an audio signal based on the audio data sent from the CPU 10 and sends it to the speaker 24. The speaker 24 converts the amplified audio signal (electric signal) sent from the amplifier 23 into audio (acoustic signal) and outputs it.

  In the map display device configured as described above, when the user operates the touch panel 15, for example, map display, current location display, route search, route guidance, map scroll, or POI (Point of Interest) that is a navigation function. In addition to searching, the CD / DVD drive 18 plays a CD or DVD 18a, receives a radio broadcast, and the like. Further, various service information is acquired by communicating with a server outside the vehicle using the mobile phone 20.

  FIG. 2 is a diagram illustrating an example of map attributes outside and within a specific area permitted to be used from outside the specific area. In this example, the map attributes in the specific area permitted to be used from outside the specific area are the main road, satellite photograph, main city name, main road network, and main POI. In addition, the map attribute in the specific area permitted to be used from outside the specific area is, in principle, a map attribute that can be obtained from outside the specific area.

  FIG. 3 is a diagram showing an example of map display, and shows a case where the inside of the specific area and the outside of the specific area are displayed in different forms. In general, a map is managed in units of a fixed partition area (referred to as tile, parcel, or region). FIG. 3 shows an example in which the vehicle is in a specific area. In this case, all map attributes are displayed. FIG. 3 shows a case where the vehicle travels from a point A in a specific area to a point B on the border and travels a route to a point C outside the specific area.

  Fig.4 (a) is a figure which shows the example of a map display when the own vehicle goes out of a specific area. When the vehicle position passes the border point B, a satellite photograph is displayed as a permitted map attribute in the specific area, and a main road, a route of the main road, and a main city are displayed in broken lines thereon. FIG. 4B is a diagram showing an example of a map display when only a satellite photograph exists as a map attribute permitted to be displayed within a specific area. FIG. 4C is a diagram showing an example of a map display when the conventional vehicle goes out of the specific area. When the vehicle position passes the border point B, the specific area is gray and blank. Display.

  Next, the operation of the map display device configured as described above according to Embodiment 1 of the present invention will be described with reference to the flowchart shown in FIG. It is assumed that the route calculation from the specific area to the outside of the specific area is completed in a state where the vehicle position is within the specific area, and a map as shown in FIG. 6A is displayed.

  When the process is started, first, the current position is calculated (step ST11). That is, the CPU 10 calculates the current position based on the current position data received from the GPS receiver 12, the speed data received from the vehicle speed sensor 13, and the direction data received from the direction sensor 14. The “current position calculation unit” of the present invention is configured by the function of calculating the current position of the CPU 10.

  Next, it is checked whether or not it is within a specific area (step ST12). That is, the CPU 10 reads the specific area boundary data D1 from the HDD 17, and checks whether the current position calculated in step ST11 is on the specific area side from the boundary indicated by the read specific area boundary data D1.

  If it is determined in step ST12 that the area is not within the specific area, then display within the specific area is performed using the specific area use permission database D3 (step ST13). That is, the CPU 10 reads an image of a map attribute permitted, for example, satellite photograph data, from the specific area use permission database D3 stored in the HDD 17, and sends it to the drawing chip 21 as display data.

  Next, display outside the specific area is performed using the database outside the specific area D4 (step ST14). That is, the CPU 10 reads the map data from the outside-specific area database D4 from the HDD 17 and sends it to the drawing chip 21 as display data. The drawing chip 21 draws a satellite photograph image based on the display data sent from the CPU 10 in step ST13, and draws a map based on the display data sent from the CPU 10 in step ST14 to obtain a video signal. Sent to the liquid crystal monitor 22. The liquid crystal monitor 22 displays an image based on the video signal sent from the drawing chip 21. Thereafter, the sequence returns to step ST11, and the above-described processing is repeated.

  As a result of the processing of step ST13 and step ST14, a map in which a satellite photograph is inserted in a specific area as shown in FIG. 6B is displayed, and the route display (triangle mark) on the main road remains unchanged. However, the main roads in the specific area are displayed with broken lines, the location and name of the main city (XX1 city) are displayed, and the display of the word “border” in the specific area is not lost. Move or change expression outside a specific area. The display outside the specific area does not change.

  If it is determined in step ST12 that the area is within the specific area, then the specific area dedicated database D2 is decrypted (step ST15). That is, the CPU 10 sends the encrypted map data read from the specific area dedicated database D2 of the HDD 17 to the encryption chip 19. The encryption chip 19 decrypts the encrypted map data sent from the CPU 10 and returns it to the CPU 10.

  Next, display within the specific area is executed using the specific area dedicated database D2 (step ST16). That is, the CPU 10 receives the map data decrypted in step ST15 from the encryption chip 19 and sends it to the drawing chip 21 as display data.

  Next, the display outside the specific area is executed using the database outside the specific area D4 (step ST17). That is, the CPU 10 reads the map data from the non-specific area database D4 stored in the HDD 17 and sends it to the drawing chip 21 as display data. The drawing chip 21 draws a map in the specific area based on the display data sent from the CPU 10 in step ST16, and draws a map outside the specific area based on the display data sent from the CPU 10 in step ST17. Then, it is sent to the liquid crystal monitor 22 as a video signal. The liquid crystal monitor 22 displays an image based on the video signal sent from the drawing chip 21. By the processing of these steps ST15 to ST17, a map is displayed both inside and outside the specific area as shown in FIG. Thereafter, the sequence returns to step ST11, and the above-described processing is repeated.

  FIG. 7 is a diagram showing an example of the map display in the conventional map display device shown for comparison with the map display in the map display device according to the first embodiment, and FIG. FIG. 7B is a display example when the position is within the specific area, and FIG. 7B is a display example when the vehicle position is outside the specific area. When the vehicle position is outside the specific area, the conventional map display device displays a map within the specific area when the vehicle position is outside the specific area or from outside the specific area, as shown in FIG. Although the specific area is filled with gray at the time of scrolling, in the map display apparatus according to the first embodiment, as shown in FIG. Is displayed. As a result, it is possible to display a specific area where it is necessary to pay attention to the handling of the map without a sense of incongruity.

  Note that the map display device according to the first embodiment described above is configured not to operate the own vehicle position correction function of the normal navigation device, that is, the function of correcting the current position from outside the specific area to within the specific area. be able to.

  Further, when the vehicle moves from the specific area to the outside of the specific area, the border point B shown in FIG. 3 (corresponding to the boundary point of the present invention) is stored, and the CPU 10 A route search to the border point B can be performed. The CPU 10 in this case corresponds to the route search unit of the present invention.

  Furthermore, when a route search from outside the specific area to the specific area is performed, the main road network can be used to connect the main road to the destination with a temporary line. In addition, the route obtained by the route search from the specific area to the outside of the specific area is not displayed when the vehicle goes out of the specific area, and the travel locus is also deleted. However, when the route display is permitted, the route display is left, and the travel locus display is also left.

Embodiment 2. FIG.
In the map display device according to the second embodiment of the present invention, the specific area dedicated database D2 that can be used in the specific area is different from the specific area boundary data D1, the specific area use permission database D3, the non-specific area database D4, and the program D5. The data is stored in a storage medium.

  FIG. 8 is a block diagram showing a configuration of a map display device according to Embodiment 2 of the present invention. This map display device is configured by providing an internal SD card 31 and a removable SD card 32 in place of the HDD 17 of the map display device according to the first embodiment shown in FIG. The built-in SD card 31 corresponds to the memory card of the present invention.

  The built-in SD card 31 is attached to a substrate on which components constituting the map display device are mounted, and has a structure that cannot be removed. If the built-in SD card 31 is forcibly removed, it is mechanically or electrically destroyed. The built-in SD card 31 stores specific area boundary data D1 and a specific area dedicated database D2, and is read by the CPU 10. The specific area boundary data D1 and the specific area dedicated database D2 stored in the built-in SD card 31 can be configured to be updated using a removable SD card, a write-only tool, or a communication device.

  The removable SD card 32 stores a specific area use permission database D3, a non-specific area database D4, and a program D5. Data stored in the removable SD card 32 is read by the CPU 10.

  The operation of the map display device according to the second embodiment is the same as that of the first embodiment described above except that data is acquired from the built-in SD card 31 and the removable SD card 32 instead of acquiring data from the HDD 17. This is the same as the operation of the map display device.

  According to the map display device according to the second embodiment, the map display device can be disassembled to prevent the specific area dedicated database D2 from being illegally decoded. In addition, the road in a specific area is acquired from, for example, a satellite photograph or a publicly available map, and a simple database for the specific area is created and stored in a removable SD card 32 for use. can do.

Embodiment 3 FIG.
In general, when the GPS receiver 12 cannot be received, the navigation device specifies the position of the vehicle by the dead reckoning function, but improperly blocks the reception of the GPS receiver 12 and inputs pseudo vehicle speed data and direction data. By doing so, it is conceivable that the vehicle position is unjustly set within a specific area. In order to cope with such a situation, the map display device according to the third embodiment of the present invention reconfirms that it is within a specific area.

  The configuration of the map display device according to the third embodiment is the same as the configuration of the map display device according to the first embodiment shown in FIG. In this map display device, when the GPS receiver 12 cannot normally receive the radio wave transmitted from the GPS satellite, the CPU 10 prohibits the use of the specific area dedicated database D2 inside the HDD 17.

  In addition, when the GPS receiver 12 cannot normally receive the radio wave transmitted from the GPS satellite, when a predetermined time required for passage through a tunnel or the like has elapsed or when traveling a predetermined distance, Can be configured to prohibit use.

  In addition, when the GPS receiver 12 cannot normally receive the radio wave transmitted from the GPS satellite, the area where the map can be displayed using the specific area dedicated database D2 is limited to a certain range centered on the own vehicle position. Alternatively, the map attributes that can be used among the map attributes stored in the specific area dedicated database D2 can be limited.

  In addition, when a radio wave that can be received only in a specific area (including an analog broadcast wave, a digital broadcast wave, or a radio wave for communication used by the mobile phone 20) is received, the use of the specific area dedicated database D2 is permitted. Can be configured. In addition, when a radio wave that cannot be received in a specific area is received, use of the specific area dedicated database D2 can be prohibited.

  Further, the present location can be transmitted to a server (not shown), and when permission is obtained from the server, the use of the specific area dedicated database D2 can be permitted. When the mobile phone 20 having the GPS function is used and the current location is transmitted to the server, the location of the mobile phone 20 is confirmed by the server, and the location of the mobile phone 20 is within the specific region. It can be configured to allow the use of the dedicated database D2.

  Further, when an unauthorized use of the specific area dedicated database D2 is detected, it is possible to notify the department that manages the navigation device and disable the navigation apparatus from the department.

Embodiment 4 FIG.
There are areas where basic map data does not exist, depending on how well the map database is maintained, even outside specific areas. The map display apparatus according to Embodiment 4 of the present invention addresses such a situation.

  FIG. 9 is a block diagram showing a configuration of a map display device according to Embodiment 4 of the present invention. The configuration of the map display device according to the fourth embodiment is the same as that of the map display device according to the first embodiment shown in FIG. 1 except for data stored in the HDD 17. That is, the HDD 17 is added with the no-map area boundary data D6 and the no-map area simple data D7.

  The no-map area boundary data D6 is data indicating a boundary between an area where basic map data does not exist and an existing area. Further, it is assumed that only the satellite photograph exists in the map-free area simple data D7 as shown in the map attribute that can be used when the vehicle position in FIG. 10 is outside the specific area.

  The operation of the map display device according to Embodiment 4 configured as described above will be described. The operation of this map display device is different from that of the map display device according to the first embodiment in the method of displaying the same map attribute outside the specific region and the specific region when the vehicle position is outside the specific region.

  FIG. 11 is a diagram showing an image of a map display. When the vehicle position is within the specific area, as shown in FIG. 11A, the outside of the specific area where basic map data does not exist is displayed as a satellite photograph. When the vehicle position is outside the specific area, as shown in FIG. 11B, the specific area is displayed as a satellite photograph, and the main road is displayed as a broken line. At this time, the color of the satellite photograph is changed and displayed so that the area outside the specific area without the map data can be distinguished from the specific area. In this case, map data with different display colors can be stored in the HDD 17 in advance, or the color can be changed when displayed.

  In each of the embodiments described above, the specific area is described as “country”, but the present invention can also be applied to cases where the use of a map is restricted in a specific area in the state or country. For example, when there is a map database that is open only to residents in the gated city, the map display device according to the first to fourth embodiments can be applied with the gated city as a specific area.

Claims (17)

A current position calculator for calculating the current position;
A database dedicated to a specific region that stores map data that is only allowed in a specific region,
A specific area use permission database storing data permitted to display inside the specific area outside the specific area;
A database outside the specific area storing map data outside the specific area that can be used both within the specific area and outside the specific area;
When the current position calculated by the current position calculation unit is outside the specific area, display data for displaying a map outside the specific area is generated using the map data acquired from the non-specific area database and the specific area is used. Display data for displaying an image of a map attribute permitted in a specific area using data acquired from a permission database, and the current position calculated by the current position calculation unit is within the specific area Generates display data that displays a map outside a specific area using map data acquired from a database outside the area, and generates display data that displays a map within the specific area using map data acquired from the database dedicated to the specific area A control unit,
A map display device comprising: a display unit configured to display a map or an image of permitted map attributes based on display data generated by the control unit. The map according to claim 1, wherein the map attribute of the image generated based on the data stored in the specific area use permission database is set to permit or disallow for each of display, search, guidance, or POI. Display device. A route search unit that searches for routes from outside the specified area to the specified area using the main road network included in the data acquired from the specified area use permission database, and connects the main road to the destination with a temporary line The map display device according to claim 1. 4. The map display device according to claim 3, wherein the specific area use permission database includes data indicating a main POI.   4. The map display device according to claim 3, wherein the specific area use permission database includes image data that can be obtained outside the specific area. 2. The map display device according to claim 1, wherein the database for the specific area is stored in a built-in memory card, and the map data is mechanically or electrically destroyed when the memory card is taken out. 2. The map display device according to claim 1, wherein the control unit permits use of the database dedicated to the specific area when receiving a radio wave that can be received only in the specific area. The map display device according to claim 1, wherein the control unit prohibits the use of the database dedicated to the specific area when receiving a radio wave that cannot be received in the specific area. An encryption chip for decrypting encrypted data is provided,
The specific area database encrypts and stores map data that can only be used within a specific area.
The control unit sends the encrypted map data acquired from the specific area dedicated database to the encryption chip, and displays the map in the specific area using the map data decrypted by the encryption chip. The map display device according to claim 1, wherein: The route search unit stores a boundary point when moving from within a specific region to outside the specific region, and searches for a route to the boundary point when searching for a route from outside the specific region to the specific region. The map display device according to claim 3. 2. The control unit according to claim 1, wherein the control unit changes a display position or an expression so that information extending between the inside of the specific area and the outside of the specific area can be displayed when moving from the specific area to the outside of the specific area. Map display device. The map display device according to claim 1, wherein the control unit causes the display unit to display an area where no map data exists and an area where the use of the map is prohibited in different expressions. 2. The map display device according to claim 1, wherein the control unit prohibits the use of the database dedicated to the specific area after a predetermined time has elapsed or after traveling for a predetermined distance when the GPS radio wave cannot be normally received. 2. The control unit according to claim 1, wherein if the GPS radio wave cannot be normally received, the control unit limits a region where the map can be displayed using a database dedicated to the specific region to a predetermined range centered on the vehicle position. Map display device. The map display device according to claim 1, wherein when the GPS radio wave cannot be received normally, the control unit restricts map attributes that can be used among the map attributes stored in the database for the specific area. 2. The map display device according to claim 1, wherein the specific area dedicated database is stored in a storage medium different from the specific area use permission database and the non-specific area database. The map display device according to claim 1, wherein the control unit is configured not to operate a vehicle position correction function for correcting the current position from outside the specific area to within the specific area.

Images