JP4901081B2 - Navigation device and map data updating method - Google Patents

Description

  The present invention relates to a navigation apparatus that displays an electronic map on a display and a method for updating the electronic map, and more particularly to a navigation apparatus and a map data update method that can display the latest map.

  Conventionally, in-vehicle navigation apparatuses display a map image when displaying the current position of the host vehicle, the destination of the host vehicle, and the like on a screen. Here, a navigation device including a recording device such as an HDD (Hard Disc Drive) that supplies map data for generating a map image is known.

  As described above, when an HDD is used as a recording device for supplying map data, a DVD-ROM (Digital Versatile) is used by a disk reproducing device when a new road is created or a landform change occurs due to land reclamation. The updated map data (hereinafter referred to as updated map data) is read from a recording medium such as a Disc-Read Only Memory (CD-ROM) or a CD-ROM (Compact Disc-Read Only Memory) and written in the HDD.

A technique is known in which updated map data is acquired by communication means that updates with a host station, and map data recorded in the HDD is automatically updated (for example, Patent Document 1).
JP-A-8-95488

  However, in the conventional technology including Patent Document 1, when the navigation device is mounted on the vehicle, the update operation is performed only in a state where the engine of the vehicle is running. In other words, the update operation is performed only when the navigation device is powered on. Here, the update work refers to the update map data read from a recording medium such as a DVD-ROM or CD-ROM while the HDD is mounted on the navigation device with respect to the HDD in which the map data before the update is recorded. Indicates that map data is written to the HDD. In addition, the update work indicates that the update map data is received from the host station and the updated map data is written to the HDD while the HDD is mounted on the navigation device with respect to the HDD in which the map data before the update is recorded. .

  In such a navigation device, when the amount of update map data is large, there is a problem that the update operation fails if the power of the navigation device is turned off during the update operation.

  In order to solve such a problem, a technique is known in which the data writing method for recording updated map data to the HDD that stores the map data is a TFAT (Transaction-Safe File Allocation Table) method. Yes. The TFAT method is a method in which when writing actual data, a special file for guaranteeing data consistency is written to the HDD first, and data is written to the HDD after data consistency is obtained. Therefore, in the TFAT method, there is only a state where data is completely written to the HDD or a state where the data is not completely written, and even when the power is turned off, the data is partially written to the HDD. Must not.

  However, when the data writing method to the HDD for recording the map data is the TFAT method, a special file for guaranteeing data consistency is first written, so that the update map data is written to the HDD. There was a problem that it took a long time to complete the update process of the map data because it was late. In addition, there is a problem that it is impossible to play a disc (for example, a DVD video or a music CD) other than a DVD-ROM or CD-ROM in which updated map data is recorded for a long time during the update operation. It was.

  In addition, when there are a plurality of DVD-ROMs and CD-ROMs on which updated map data is recorded, the user needs to replace the next disk after the update work with the first disk is completed. For this reason, the user has to monitor the navigation device for a long time until the update work for all the disks is completed, which increases the burden.

The present invention has been made to solve such a problem, and when the updated map data is written to the HDD while guaranteeing the data consistency, the reproducing apparatus is exclusively used by the disk on which the updated map data is recorded. The purpose is to be able to make the time spent as short as possible.

To solve the problems described above, in the present invention, the update map data read by the reproducing apparatus from the recording disk by temporarily all recorded in the second area of the map data recording device, from the second region at a predetermined timing The read updated map data is updated and recorded in the background in the first area of the map data recording device while ensuring its consistency.

According to the present invention configured as described above, the updated map data read out by the playback device is written to the second area of the map data recording device at a relatively high speed, and at a predetermined timing thereafter, the second map data is read out. The updated map data is written in the background over time from the area to the first area . Thus, as compared with the case of directly writing the update map data read from the reproducing apparatus in the first region, it requires only a short time for writing the update map data read from the reproducing apparatus to the second region. Accordingly, the time for which the playback device is occupied by the update operation of the map data is shortened, and the user can update except for the relatively short time when the update map data is written from the playback device to the second area of the map data recording device . Even during work, the playback device can be used as usual.

In addition, once the updated map data read by the playback device is written to the second area of the map data recording apparatus, the update map data is written from the second area to the first area in the background. As a result, the user only has to monitor the navigation device for a relatively short time required for the updated map data to be written into the second area , and the burden is greatly reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a navigation device 1 according to the present embodiment. In FIG. 1, reference numeral 12 denotes a disk playback device, which reads update map data from an update disk 11 such as a DVD-ROM (corresponding to the playback device in the claims). The update map data for one year is recorded on one update disk 11. Further, the updated map data recorded on the update disks 11 for different years do not overlap with each other. Here, although DVD-ROM is used as a medium for recording updated map data, other media such as CD-ROM may be used.

  The update operation of the map data is usually performed every year, but some users may update a plurality of years at once. For example, when updating three years at a time, in order to complete the update work, the first update disk 11a in which the update map data two years ago (for example, 2002) is recorded, one year ago (for example, 2003) It is necessary to read out all the update disks 11 of the second update disk 11b in which the update map data of (year) is recorded and the third update disk 11c in which the update map data of this year (for example, 2004) is recorded by the disk playback device 12. There is.

  A map data recording device 13 records various types of map data required for map display, route search, and the like. The map data recording device 13 records the updated map data temporarily when the first area (corresponding to the protected area of the claims) is recorded (for example, TFAT method) while data consistency is secured. (For example, FAT32 system) second area (temporary storage area of claims). Here, the recording to the second area of the map data recording device 13 can be performed at a higher speed than the recording to the first area.

  Map data necessary for map display, route search, and the like is recorded in the first area. The second area is used when the map data is updated. Here, the update work refers to the update map data read by the disk playback device 12 being recorded in the second area of the map data recording device 13 and recorded in the second area of the map data recording device 13. A series of operations for reading updated map data at a predetermined timing and writing it in the first area is shown. Although the HDD is used as the map data recording device 13 here, a rewritable recording medium such as a semiconductor memory may be used.

  A map data control unit 14 controls reading and writing of updated map data from the map data recording device 13. Specifically, when the map data is updated, the update map data read from the update disk 11 by the disk reproducing device 12 is temporarily recorded in the second area, and the update map data is updated from the second area at a predetermined timing. Is read and written to the first area. Further, map data is read from the first area during normal use such as map display or route search.

  Reference numeral 15 denotes a position measuring device that measures the current position of the vehicle, and includes a self-contained navigation sensor, a GPS (Global Positioning System) receiver, a position calculation CPU, and the like. The self-contained navigation sensor includes a vehicle speed sensor (distance sensor) that outputs a single pulse for each predetermined travel distance to detect the travel distance of the vehicle, and an angular velocity sensor such as a vibration gyro that detects the rotation angle (movement direction) of the vehicle. (Relative orientation sensor). The self-contained navigation sensor detects the relative position and direction of the vehicle using these vehicle speed sensor and angular velocity sensor.

  The position calculation CPU calculates an absolute host vehicle position (estimated vehicle position), heading, and traveling speed based on data on the relative position and heading of the host vehicle output from the self-contained navigation sensor. The GPS receiver receives radio waves transmitted from a plurality of GPS satellites with a GPS antenna and performs a three-dimensional positioning process or a two-dimensional positioning process to calculate the absolute position, direction, and traveling speed of the vehicle ( The vehicle direction is calculated on the basis of the current vehicle position and the current vehicle position one sampling time ΔT before).

  A map data memory 16 temporarily stores map data read from the first area of the map data recording device 13. In other words, the map data control unit 14 inputs information on the current vehicle position from the position measurement device 15 and outputs an instruction to read out a predetermined range of map data including the current vehicle position, thereby searching for a map display or guidance route. The map data necessary for this is read from the first area of the map data recording device 13 and stored in the map data memory 16.

  Reference numeral 17 denotes a remote controller (remote controller), in which the user sets various types of information (for example, a route guidance destination) for the navigation apparatus 1 and various operations (for example, menu selection operations, enlargement / reduction operations, Various controls (buttons, joysticks, etc.) for performing manual map scrolling, character input, data updating, etc. are provided. Reference numeral 18 denotes a remote control interface which receives an infrared signal corresponding to the operation state from the remote control 16.

  Reference numeral 19 denotes a processor (CPU) that controls the entire navigation apparatus 1. Reference numeral 20 denotes a ROM which records various programs (such as a map data update program and a guidance route search processing program). Reference numeral 21 denotes a RAM which temporarily stores data obtained during various processes and data obtained as a result of various processes. The CPU 19 corresponds to the control device in the claims.

  The aforementioned CPU 19 controls the disk playback device 12 according to the map data update program recorded in the ROM 20. The disk reproducing device 12 reads the update map data from the inserted update disk 11. Then, the CPU 19 controls the map data control unit 14 so as to temporarily record the updated map data in the second area of the map data recording device 13 by a writing method such as the FAT32 method. In addition, the CPU 19 controls the map data control unit 14 to read the updated map data from the second area of the map data recording device 13 at a predetermined timing and write the updated map data to the first area by a writing method such as the TFAT method. . Here, the update map data flows from the update disk 11 to the second area of the map data recording device 13 and the first area of the map data recording device 13 as shown in FIG.

  Specifically, the CPU 19 first determines the type of the update disk 11 with reference to the TOC (Table Of Contents) of the update disk 11 inserted in the disk playback device 12. The type of the update disk 11 is information indicating the order (version, update year, etc.) of the update disk 11.

  When the type of the update disk 11 is determined, the CPU 19 associates the updated map data read by the disk reproducing device 12 with the types of the first update disk 11a to the third update disk 11c, and the map data recording device 13. Is recorded in the second area by the map data control unit 14. Here, the first update disk 11a to the third update disk 11c may be inserted into the disk playback device 12 in any order. At this time, all the update disks 11a to 11c need not be inserted.

  Next, the CPU 19 controls the map data control unit 14 to read the updated map data recorded in the second area of the map data recording device 13 at a predetermined timing and write it in the first area. Here, the predetermined timing is a state in which the updated map data is recorded at least in the second area of the map data recording device 13 and the navigation apparatus 1 is powered on. The timing at which the CPU 19 determines that there is unupdated and oldest updated map data (in this case, updated map data two years ago recorded on the first update disk 11a) in the recorded updated map data. Indicates.

  When an HDD or a semiconductor memory is used as the map data recording device 13, the updated map data read by the disk reproducing device 12 is recorded in the second area of the map data recording device 13, and the map data The update map data recorded in the second area of the recording device 13 can be read out at a predetermined timing and written in the first area at the same time. Further, the CPU 19 erases the updated map data read out for recording in the first area in the second area of the map data recording device 13.

  By the way, when the updated map data recorded in the second area of the map data recording device 13 is read out and written into the first area, the oldest of the unupdated update disks 11 according to the order of the update disks 11. It is necessary to update in order from the first update disk 11a in which the update map data is recorded. For example, it is assumed that only the first update disk 11a and the third update disk 11c are inserted into the disk playback device 12. In this case, only the update map data from the first update disk 11a and the update map data from the third update disk 11c are recorded in the second area of the map data recording device 13. Therefore, the update map data recorded from the first update disk 11a can be read from the second area and written to the first area, but the update map data from the second update disk 11b is skipped, The updated map data recorded from the third update disk 11c cannot be read from the second area and written to the first area.

  Accordingly, the CPU 19 generates a warning image for prompting insertion of the second updated disk 11b into the disk reproducing device 12 as shown in FIG. 3 at a warning timing described later, and generates a display device described later. 29, or a voice message “Please insert the 2004 updated disc” is generated by the voice generation unit 30 described later and output from the speaker 31 described later.

  The warning timing is, for example, the timing at which the CPU 19 judges the type of the update disk 11 with reference to the TOC of the update disk 11 inserted in the disk playback device 12 and reads the TOC that is contrary to the order of the update disks 11 (first order). 1 shows the timing at which the TOC of the first update disk 11a is read and the TOC of the third update disk 11c is read before the TOC of the second update disk 11b is read. In addition, the timing at which writing of the updated map data to the first area by the first update disk 11a recorded in the second area is completed (the second area of the updated map data by the next second update disk 11b). May be the timing at which reading from is started. Further, any timing between the two timings described above may be used.

  Further, the CPU 19 searches for a guide route with the lowest cost connecting the current location to the destination using the map data stored in the map data memory 16 according to the guide route search processing program recorded in the ROM 20, for example. Process.

  A guidance route memory 22 stores the guidance route data searched by the CPU 19. The guidance route data stores the position of each node and an intersection identification flag indicating whether each node is an intersection, corresponding to each node from the current location to the destination.

  A display controller 23 generates map image data necessary for display on the display device 29 based on the map data stored in the map data memory 16.

  A video RAM 24 temporarily stores map image data generated by the display controller 23. That is, the map image data generated by the display controller 23 is temporarily stored in the video RAM 24, and the map image data for one screen is read and output to the image composition unit 28.

  The menu generation unit 25 generates and outputs a menu image necessary for performing various operations using the remote controller 17 and a warning image shown in FIG. A guidance route generator 26 generates guidance route data by using the processing result of the guidance route search processing program stored in the guidance route memory 22. That is, from the guidance route data stored in the guidance route memory 22, the one included in the map area drawn in the video RAM 24 at that time is selectively read out, and is overlaid on the map image and highlighted with a predetermined color. Draw a guidance route.

  A mark generation unit 27 generates and outputs a vehicle position mark to be displayed at the position of the host vehicle after the map matching process, various landmarks to display a gas station, a convenience store, and the like. The map matching process is the map data read to the map data memory 16, the data of the position and direction of the own vehicle by the GPS receiver measured by the position measuring device 15, and the estimation by the autonomous navigation sensor. This refers to processing for correcting the position of the traveling position of the host vehicle on the road of the map data using the vehicle position and vehicle direction data.

  The image composition unit 28 synthesizes and outputs various images. That is, the map image data read out by the display controller 23 is overlaid with the image data output from each of the menu generating unit 25, the guide route generating unit 26, and the mark generating unit 27, and image synthesis is performed. 29. Thereby, on the screen of the display device 29, the map image around the host vehicle is displayed together with the vehicle position mark of the host vehicle.

  The voice generation unit 30 utters a voice for intersection guidance, a voice for various operation guidance, and the like. The speaker 31 outputs the sound generated by the sound generator 30 to the outside. Reference numeral 32 denotes a bus, which is used to exchange data with each other between the various functional configurations described above.

  Next, the operation of the navigation device and the map data update method according to the present embodiment will be described. FIG. 4 is a flowchart showing an operation of recording updated map data in the second area of the map data recording device 13 of the navigation device 1 according to the present embodiment. FIG. 5 is a flowchart showing an operation of recording updated map data from the second area to the first area of the map data recording device 13 of the navigation apparatus 1 according to the present embodiment.

  In FIG. 4, first, the CPU 19 checks whether or not the update disk 11 has been inserted into the disk playback device 12 (step S1). If the update disk 11 is not inserted (NO in step S1), the process in step S1 is repeated.

  On the other hand, if the CPU 19 determines that the update disk 11 has been inserted into the disk playback device 12 (YES in step S1), the CPU 19 reads the TOC of the update disk 11 read out by the disk playback device 12. The type of the update disk 11 is determined with reference to the map data control unit 14 (step S2). The map data control unit 14 associates the updated map data read out by the disc playback device 12 with the type of the update disc 11, and the second area of the map data recording device 13 (the area where the writing method is the FAT32 method or the like) (Step S3).

  The CPU 19 determines whether or not recording of update map data by any one of the update disks 11 (first update disk 11a to third update disk 11c) is completed in the second area of the map data recording device 13. (Step S4). If the recording is not completed (NO in step S4), the recording of the updated map data is continued and the process of step S4 is repeated.

  On the other hand, when the recording is completed (YES in step S4), the CPU 19 checks whether or not an operation for ending the update of the map data is performed by the remote controller 17 or the like (step S5). If an operation to end the update of the map data has been performed (YES in step S5), the process ends, and if an operation to end the update of the map data has not been performed (NO in step S5) ) Insert one of the next update disks 11 and return to the process of step S1.

  On the other hand, in FIG. 5, the CPU 19 checks whether or not the updated map data is recorded in the second area of the map data recording unit 13 (step S11). If the updated map data is not recorded in the second area (NO in step S11), the process of step S11 is repeated until the updated map data is recorded in the second area.

  On the other hand, when updated map data is recorded in the second area (YES in step S11), CPU 19 refers to the type of disk 11 recorded in association with the updated map data, and has not yet recorded it. It is checked whether or not there is the oldest updated map data in the updated map data (step S12). If it is determined that there is no oldest update map data among the unupdated update map data (NO in step 12), an update disk recording the oldest update map data among the unupdated update map data 11 is displayed (step S13). And it returns to the process of step S11.

  On the other hand, when it is determined that there is the oldest updated map data among the unupdated updated map data (YES in step S12), the map data control unit 14 uses the second area of the map data recording unit 13. The oldest update map data recorded in the field is read out and written in the first area (area where the writing method is TFAT method or the like) (step S14).

  Then, the CPU 19 checks whether or not the update map data for one update disk 11 (one year) has been recorded in the first area of the map data recording device 13 (step S15). If the recording has not been completed (NO in step S15), the process in step S15 is repeated until the recording is completed.

  On the other hand, when the recording is completed (YES in step S15), the map data control unit 14 erases the oldest updated map data in the second area of the map data recording device 13 (step S16).

  Then, the CPU 19 checks whether or not an operation for ending the update of map data has been performed by the remote controller 17 or the like (step S17). If an operation to end the update of the map data has been performed (YES in step S17), the process ends, and if an operation to end the update of the map data has not been performed (NO in step S16) ), The process returns to the process of step S11 in order to perform the update by the next update map data.

  As described above in detail, according to the present embodiment, the first area for recording data while ensuring the consistency of data and the second area for temporarily recording updated map data are recorded as map data. In the device 13, when updating the map data, the updated map data read from the update disk 11 by the disk reproducing device 12 is temporarily recorded in the second area, and the updated map data is updated from the second area at a predetermined timing. Since the updated map data is read from the disk playback device 12 and written directly to the first area of the map data recording device 13, the update from the disk playback device 12 is performed. It takes less time to read out the map data and write it into the second area of the map data recording device 13. Accordingly, the time for which the disk reproducing device 12 is occupied by the update operation of the map data is shortened, and the user is relatively short in the time when the updated map data is written from the disk reproducing device 12 to the second area of the map data recording device 13. The disc player 12 can be used as usual even during the update operation. If the updated map data read by the disk playback device 12 is written to the second area of the map data recording device 13, the update map data is written back from the second area to the first area. Since it is performed at the ground, the user only has to monitor the navigation device 1 for a relatively short time when the updated map data is written to the second area, and the burden is greatly reduced.

  Further, according to the present embodiment, the update map data recorded on the update disk 11 is temporarily recorded in the second area of the map data recording device 13, so that the update disk 11 to be inserted into the disk playback device 12 Even when there are a plurality of disks, it is not necessary to insert a plurality of update disks 11 in order, and the burden on the user is greatly reduced.

  Further, according to the present embodiment, the updated map data recorded in the second area of the map data recording device 13 is recorded in the first area at a predetermined timing. The predetermined timing is a state in which the updated map data is recorded in at least the second area of the map data recording device 13 and the navigation apparatus 1 is powered on, and the update recorded in the second area This is the timing when the CPU 19 determines that the oldest updated map data that has not been updated is present in the map data. Therefore, when the update disk 11 that has not been updated and has the oldest updated map data recorded therein is inserted into the disk playback device 12, the updated map data read by the disk playback device 12 is recorded in the second area of the map data recording device 13. At that time, the update map data can be automatically written from the second area to the first area without any instruction from the user.

  In the present embodiment, the map data recording device 13 is provided with a first area for recording data while ensuring data consistency and a second area for temporarily recording updated map data. However, the present invention is not limited to this. For example, a first map data recording device that records data while ensuring data consistency and a second map data recording device that temporarily records updated map data may be provided. Further, the first map data recording device and the second map data recording device may be configured by a recording medium such as an HDD or a semiconductor memory. Further, the first map data recording device and the second map data recording device may be configured by different recording media.

  Also, a second map data for temporarily storing updated map data in the server is provided outside the navigation device 1 that enables transmission and reception of data to and from the communication unit provided in the navigation device 1. A recording device may be provided.

  In this embodiment, the TFAT method is exemplified as a writing method for recording data while ensuring data consistency. However, the present invention is not limited to this. For example, Ext3 (Third Extended Filesystem), Reliance, ReiserFS may be used.

  In the present embodiment, when the updated map data is read from the second area of the map data recording device 13 and written to the first area, all the updated map data corresponding to the first update disk 11a is written. The update map data corresponding to the second update disk 11b and the third update disk 11c are sequentially written, but the present invention is not limited to this. For example, the map data recording device 13 preferentially updates the updated map data of a predetermined region (for example, a state in the case of the United States, a prefecture in the case of Japan) including the position of the vehicle measured by the position measuring device 15. Alternatively, all the update disks 11a to 11c may be read from the second area and written to the first area. Thereby, the map data of the area | region relevant to the own vehicle can be updated rapidly.

  In this embodiment, at a predetermined timing for starting writing from the second area of the map data recording device 13 to the first area, the updated map data is recorded at least in the second area of the map data recording device 13. In this state, the navigation apparatus 1 is powered on, and it is determined that the updated map data recorded in the second area is determined to be the oldest one that has not been updated. According to this timing, when writing of the unupdated oldest updated map data to the second area is completed, writing from the second area to the first area is automatically started. Not. For example, the timing at which the user operates the remote controller 17 so as to record the update map data from the second area to the first area and instructs the update of the map data may be used. Here, when performing the update work using the update disk 11 for three years, the user stores all of the updated map data recorded on the update disk 11 for three years in the second area of the map data recording device 13. It is possible to write from the second area to the first area by writing an instruction.

  Also in this case, the CPU 19 displays a warning image indicating that any of the updated disks 11 is not inserted in the disk reproducing device 12 on the display device 29. The warning timing can be, for example, a timing when the user operates the remote controller 17 described above. That is, the CPU 19 is the type of the update disk 11 (update disk) recorded in association with all the update map data recorded in the second area of the map data recording device 13 at the timing when the remote controller 17 instructs. 11), if there is an update disk 11 whose order is missing, a warning image is displayed on the display device 29.

  Further, it may be the timing at which updated map data that is not actually recorded in the second area is to be recorded in the first area. That is, the CPU 19 stores the type of the update disk 11 recorded in association with the update map data recorded in the second area each time the update map data for one year is completely written in the first area. When there is no updated map data for the next year, a warning image is displayed on the display device 29. Further, any timing between the two timings described above may be used.

  In addition, the said embodiment is only what showed the example in implementation in implementing this invention, and, as a result, the technical scope of this invention should not be interpreted limitedly. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

  The present invention is useful for a navigation apparatus that updates map data by inserting an update disk into a disk playback device.

It is a block diagram which shows the structural example of the navigation apparatus by this embodiment. It is a figure which shows the example of the flow of the update map data by the navigation apparatus of this embodiment. It is a figure which shows an example of the warning screen by the navigation apparatus of this embodiment. It is a flowchart which shows the operation | movement which records update map data in the 2nd area | region of the map data recording device of the navigation apparatus by this embodiment. It is a flowchart which shows the operation | movement which records update map data from the 1st area | region of the map data recording device of the navigation apparatus by this embodiment to a 2nd area | region.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Update disk 11a 1st update disk 11b 2nd update disk 11c 3rd update disk 12 Disk reproducing | regenerating apparatus 13 Map data recording apparatus 14 Map data control part 15 Position measuring apparatus 19 CPU

Claims (4)

A playback device that plays back a recording disc that records updated map data related to the difference before and after the update, or a recording disc that records video and music data;
A first area for recording map data and a second area for temporarily recording the updated map data are provided on a common hard disk, and data consistency is ensured with respect to recording in the first area. By recording the updated map data in the second area from the recording disk on which the updated map data is recorded, the updated map data recorded in the second area is recorded in the first area. A map data recording device configured to be performed at high speed, and
When the updated map data is read from the playback device and recorded in the map data recording device , the update map data is once recorded in the second area of the map data recording device and recorded in the second area. A navigation device comprising: a control device that reads map data at a predetermined timing and updates and records it in the first area in the background. The control device sets the unupdated and oldest version of data to the updated map data recorded in the second area at a timing when it is determined that there is an unupdated and oldest version of the data. 2. The navigation device according to claim 1, wherein the navigation device updates and records in the first area in the background while sequentially reading from the second area to ensure consistency. A position measuring device for measuring the current position of the navigation device;
The control device reads out the updated map data recorded in the second area and updates and records the updated map data in the first area, and includes a predetermined range including the current position measured by the position measuring device. The navigation apparatus according to claim 1, wherein update map data is preferentially updated. A hard disk having a first area for recording map data and a second area for temporarily recording updated map data related to the difference between before and after the update. By adopting a method for ensuring consistency, data recording in the second area is performed at a higher speed than recording in the first area. A first step in which the control device of the navigation device once records all the updated map data read from the playback device for the area ;
A map data updating method, comprising: a second step in which the control device reads the updated map data recorded in the second area at a predetermined timing and updates and records the updated map data in the first area in the background.

Images