JP5099208B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation device.

  Recently, with the development of high-speed data communication, a distribution system that distributes updated map data to a navigation system mounted on a vehicle has been developed. In this distribution system, for example, when a navigation system registered in advance transmits a version of map data or the like of the system to the distribution server by communication, the distribution server compares the version with the latest version, Determine whether data update is necessary. If it is determined that the update is necessary, the difference data between the old version and the latest version transmitted by the navigation system is transmitted to the navigation system by communication. According to this, the latest map data can be obtained almost automatically.

  As such a system, Patent Document 1 describes a system in which a navigation device displays an updated portion on a screen of a navigation device based on display data transmitted from a distribution server (distribution center). The user confirms the update part displayed on the display and determines whether or not to update the map data. When the distribution server receives a data transmission request from the navigation system, the distribution server transmits the latest map data to the navigation system. The navigation system receives the map data, updates the data, and if route guidance is performed based on the searched recommended route, automatically routes to the destination based on the latest map data. Search again.

Japanese Patent Laid-Open No. 2004-125510.

  However, if the map data rewriting process is interrupted while processing such as destination setting or destination search by the user's input operation, the user's input operation or processing corresponding to the input operation is interrupted or canceled. It was sometimes. If the process being executed is interrupted, the user must wait until the rewriting process is completed, which causes stress on the user. Further, when the input operation is canceled, the user has to start the input operation from the beginning, which increases the user's labor.

  The present invention has been made in view of the above problems, and an object thereof is to provide a navigation device capable of improving usability.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a navigation device that performs guidance using map data, and includes map data storage means for storing the map data and data for acquiring update data from the outside. Using the acquisition means, the map data stored in the map data storage means and the update data, a processing means for generating new map data, and the map data stored in the map data storage means, Switching means for switching to the new map data generated by the processing means, determination means for determining whether the navigation device displays a predetermined display screen on the display means, and the process up to the predetermined display screen Operation history storage means for storing a history of user input operations on the navigation device as operation history data, and the determination means When it is determined that a predetermined display screen is displayed on the display means, and the switching to the new map data is performed by the switching means, the operation history data is determined based on the new map data. The gist of the invention is to include a return unit that performs processing and displays a new screen corresponding to the processing as a return screen instead of the predetermined display screen that has been displayed.

  According to a second aspect of the present invention, in the navigation device according to the first aspect, the predetermined display screen is a facility list screen that displays facilities searched by a user's search operation, and the return means includes The gist is to display a new facility list screen when the facility is searched using new map data as a return screen.

  According to a third aspect of the present invention, in the navigation device according to the first aspect, the predetermined display screen is a map screen having a central coordinate at a position different from the current position by a user's scroll operation, and the operation history The storage means stores the center coordinates of the map screen as the operation history data, and the return means displays a new map screen based on the new map data centered on the center coordinates as a return screen. And

  According to the invention described in each claim, usability at the time of data update in the navigation device can be improved.

Schematic of the distribution system of this embodiment. The block diagram of a navigation system. Explanatory drawing of route data. Explanatory drawing of map drawing data. Explanatory drawing of operation history data. The block diagram of a delivery server. Explanatory drawing of the process sequence of this embodiment. (A) is a menu screen, (b) is a search screen, (c) is an explanatory view of a genre selection screen. Explanatory drawing of the map screen which performed scroll operation. Explanatory drawing of an intersection enlarged screen. Explanatory drawing of a rewriting selection screen. Explanatory drawing of the map screen on which the changed part was displayed. Explanatory drawing of the process sequence of this embodiment.

(First embodiment)
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of a distribution system SY in the present embodiment.

  As shown in FIG. 1, the distribution system SY includes a distribution server Sv and a navigation system 1 mounted on the vehicle C. The distribution server Sv is connected to the navigation system 1 through a network NW such as the Internet or a satellite line so that various data can be transmitted and received.

  As shown in FIG. 2, the navigation system 1 includes a navigation unit 2 as a navigation device. The navigation unit 2 includes a CPU 10 as a state detection unit, a data acquisition unit, a determination unit, a screen output unit, a switching unit and a return unit, a nonvolatile main memory 11, a route guidance program, a ROM 12 storing a map update program, a GPS reception Part 13 is provided. CPU10 searches a route according to a route search program, and guides a route based on a route guidance program.

CPU10 inputs the position detection signal which shows coordinates, such as latitude and longitude, which GPS receiving part 13 received from the GPS (Global Positioning System) satellite, and calculates the absolute position of the own vehicle by radio wave navigation. Further, the CPU 10 inputs vehicle speed pulses and angular velocities from the vehicle speed sensor 30 and the gyro 31 provided in the host vehicle via the vehicle side I / F unit 14 provided in the navigation unit 2. Then, the CPU 10 calculates the relative position from the reference position by autonomous navigation using the vehicle speed pulse and the angular velocity, and specifies the own vehicle position in combination with the absolute position calculated by radio wave navigation.

  Further, the navigation unit 2 includes a map data storage unit for storing the map data M and a map data storage unit 15 as a new map data storage unit. The map data storage unit 15 is a writable and non-volatile memory, and is composed of an EPROM, a flash memory, or the like. The map data M includes route network data (hereinafter referred to as route data 16) for searching for a route to the destination, and map drawing data 17 for performing map drawing processing. The map data storage unit 15 stores image data 18 such as bitmap data for actually displaying a map as an image.

  The route data 16 is data for route calculation, and indicates a road network for each mesh partitioning the whole country. The route data 16 is hierarchized into a plurality for each road type, and the road network is outlined as it becomes higher level. The upper level route data 16 is data of main roads such as main national roads and highways. The lower level route data 16 indicates a network such as a prefectural road and a general road.

  Next, the data structure of the route data 16 will be described. As shown in FIG. 3, the route data 16 includes a mesh ID 16a for identifying each mesh and a version 16b assigned to each mesh. A plurality of individual link data 16c is associated with the mesh ID 16a. The link individual data 16c is data relating to each node indicating an intersection or an end point of a road included in the mesh and each link connecting each node. It has level correspondence data 16g, traffic data 16h, and road attribute data 16i.

  The link cost 16e is a parameter for calculating a recommended route, and indicates a link length, ease of traveling on the road, a passage fee, and the like. The CPU 10 of the navigation unit 2 uses the link cost 16d and various conditions to detect a route that minimizes the total cost value as a recommended route. By changing the conditions used at this time, various recommended routes such as the route with the lowest charge and the route with the shortest distance are detected.

  The node data 16f has the coordinates of the node that is the start point of the link indicated by the link ID 16d and the coordinates of the node that is the end point. The upper level correspondence data 16g indicates a higher level link having a correspondence relationship with the link. The traffic data 16h is data indicating traffic regulation of the road. The road attribute data 16i includes data indicating road attributes such as the number of widths and road widths.

  Further, the map drawing data 17 is divided for each layer, such as map drawing data 17 for schematically displaying a wide area and map drawing data 17 for showing a narrow area in detail. As shown in FIG. 4, the map drawing data 17 has a mesh ID 17a and a version 17b assigned to each mesh. Each mesh ID 17a includes road data 17d, background data 17e, name data 17f, guidance data 17g, and the like.

  The road data 17d is data relating to the road network in the mesh indicated by the mesh ID 17a and the shape interpolation point indicating the shape of the road. The background data 17e stores the background type of each area. The name data 17f is character string data such as a road name and an intersection name. The guidance data 17g stores intersection names, facility names, direction names, direction guides, caution points, intersection details data, and the like. Furthermore, the guidance data 17g has search data regarding the names and coordinates of each facility such as a golf course and a parking lot in the mesh ID 17a. The CPU 10 searches for each facility using this data in accordance with the input operation by the user. The image data 18 stored in the map data storage unit 15 is bitmap data or the like for displaying a map.

  The image processor 20 as the image output means and switching means of the navigation unit 2 shown in FIG. 2 uses the map drawing data 17 to determine the road shape, background, etc. of the display target area. Then, the image data 18 is used to generate data for outputting a map that matches the road shape and background. The generated output data is temporarily stored in the VRAM 21. Further, a video signal based on the output data is output to the display 25 as display means, and a map screen 25a as shown in FIG. 2 is displayed, for example. Further, the image processor 20 displays an index 25b indicating the vehicle position and a route index 25c indicating a route to the destination on the map screen 25a.

  As shown in FIG. 2, the navigation unit 2 includes a communication device 19. The communication device 19 has an antenna built therein, and transmits the versions 16b and 17b of the map data M (route data 16 and map drawing data 17) to the distribution server Sv via the network NW. Further, the communication device 19 receives various data such as difference data D1 as update data transmitted from the distribution server Sv. When the difference data D1 is received from the distribution server Sv, the CPU 10 stores the difference data D1 in the update data storage unit 28 of the navigation unit 2. When all the reception of the difference data D1 is completed, the difference data D1 and the map data M are used to perform processing for rewriting the map data M in the map data storage unit 15, such as a format conversion process. Then, the data generated by the processing is stored in the update data storage unit 28 as rewrite data D2 as new map data.

  When a rewrite request is output to the CPU 10 by a user input operation, the CPU 10 writes a part of the old map data M currently stored in the map data storage unit 15 in the rewrite data D2. Change.

  As shown in FIG. 2, the navigation unit 2 includes an operation history storage unit 26 as history storage means. The operation history storage unit 26 stores operation history data 27 as a history. As shown in FIG. 5, the operation history data 27 includes a current state 27a, an input operation 27b, a transition destination screen 27c, a date and time 27d, and the like. The current state 27a indicates a screen displayed on the display 25 at that time. The input operation 27b indicates an operation performed on the screen, and “selection part OO” is stored when “selection part OO” on the screen is selected. The transition destination screen 27c shows a screen transitioned by the input operation 27b. When the current screen or the transition destination screen is the map screen 25a, the center coordinates of the map screen 25a are stored as part of the current state 27a or the transition destination screen 27c, respectively. The date and time 27d indicates the date and time when the input operation was performed. The operation history data 27 is a state in which only the identification data of the screen is stored in the current state 27a when the screen is simply displayed or when waiting for the user's input operation. Further, the operation history data 27 is deleted when the ignition is turned off.

  Further, an operation switch 29 is provided adjacent to the display 25 of the navigation system 1. The display 25 is a touch panel. When the operation switch 29 or the touch panel is input, the external input I / F unit 22 included in the navigation unit 2 outputs a signal corresponding to the input operation of the operation switch 29 to the CPU 10.

  Furthermore, the audio processor 23 of the navigation unit 2 reads audio data from an audio file database (not shown) according to the control of the CPU 10. Then, a voice signal or the like for guiding the route by D / A converting the voice data is output to the speaker 24.

  Next, the configuration of the distribution server Sv will be described with reference to FIG. The distribution server Sv includes a CPU 40, a RAM 41, a ROM 42, a communication I / F 43, and an update data storage unit 45. The CPU 40 transmits / receives various data to / from the navigation system 1 via the communication I / F 43. The update data storage unit 45 stores the latest version update route data 46 and update map drawing data 47. The CPU 40 receives the versions 16b and 17b for each mesh of the map data M of the navigation system 1 from the navigation system 1, and the versions 16b and 17b, the update route data 46 and the update map of the distribution server Sv. Each version of the drawing data 47 (hereinafter referred to as a server side version) is compared. When there is a mesh having versions 16b and 17b older than the server-side version among the received versions 16b and 17b, the CPU 40 of the distribution server Sv updates the data of the latest version of the mesh to the update data storage unit. 45, and is transmitted to the navigation system 1 as difference data D1.

  Next, the processing procedure of this embodiment will be described with reference to FIG. When the navigation unit 2 is activated, the CPU 10 of the navigation unit 2 performs processing using map data such as route guidance to the destination and guidance around the vehicle position (step S1). Further, the CPU 10 stores the history of the user's input operation as operation history data 27 in the operation history storage unit 26 (step S2). For example, when the “search” selection unit 50a is selected on the menu screen 50 as the search screen shown in FIG. 8A, the “menu screen” is stored in the current state 27a of the operation history data 27 and input. “Selection 50a” is stored in the operation 27b. When the selection button 50a is pressed to make a transition to the search screen 51 as the search screen shown in FIG. 8B, the “search screen” is stored in the transition destination screen 27c of the operation history data 27.

  Further, the CPU 10 inquires of the distribution server Sv whether there is an update of the route data 16 or the map drawing data 17 (step S3). At this time, the CPU 10 transmits the mesh IDs 16a and 17a of each mesh of the map data M and the versions 16b and 17b of each mesh to the distribution server Sv.

  When the CPU 40 of the distribution server Sv receives the mesh IDs 16a and 17a and the versions 16b and 17b, the CPU 40 compares the mesh IDs 16a and 17a with the server-side versions assigned to the meshes of the update route data 46 and the update map drawing data 47, respectively. When the server side version has a newer mesh, data indicating “updated” is transmitted to the navigation system 1. If no update has been performed, data indicating “no update” is transmitted.

  The CPU 10 of the navigation system 1 determines whether or not there is an update based on the data received from the distribution server Sv (step S4). If there is no update (NO in step S4), the process returns to step S1 and the above-described processing is repeated. If it is determined that there is an update (YES in step S4), a transmission request for difference data D1 is transmitted to distribution server Sv.

  When the distribution server Sv receives the transmission request, the distribution server Sv reads the data that is the target of the transmission request from the update route data 46 or the update map drawing data 47, and divides it as difference data D1 and transmits it to the navigation system 1. To do. The CPU 10 of the navigation system 1 receives the difference data D1 transmitted from the distribution server Sv (step S5). The received difference data D1 is stored in the update data storage unit 28.

  Then, the CPU 10 performs processing using the acquired difference data D1 and the route data 16 or the map drawing data 17 stored in the map data storage unit 15 to generate rewrite data D2 (step S6). . Further, the CPU 10 stores the generated rewrite data D2 in the update data storage unit 28 so that it can be rewritten.

  The CPU 10 determines whether or not the processing process has been completed (step S7). If the CPU 10 determines that the processing process has ended (YES in step S7), the CPU 10 detects the state of the navigation system 1 (step S8). At this time, the CPU 10 determines the screen currently displayed on the display 25 based on the operation history data 27. Further, based on the input operation 27b and the date / time 27d of the operation history data 27, the time when the operation unit of the touch panel is operated is determined.

  Subsequently, the CPU 10 determines whether or not the detected state of the navigation system 1 is a predetermined state (step S9). The predetermined state is a state in which a predetermined screen is displayed or a state in which a user performs a predetermined operation. In the present embodiment, the predetermined screen is a screen 50 to 52 for searching for a destination or the like as shown in FIGS. 8A to 8C, and as shown in FIG. A map screen 25a in which the current position is out of the screen, and an intersection enlargement screen 54 as a warning screen as shown in FIG. On the intersection enlargement screen 54, a map screen 25a and a guidance screen 54a for guiding an intersection scheduled to pass are displayed. The state in which the predetermined operation has been performed is a state in which the touch panel and the operation switch 29 are pressed down within a predetermined time (for example, 60 seconds) from the time point.

  When determining that the state of the navigation system 1 is a predetermined state (YES in step S9), the CPU 10 controls the image processor 20 to display the rewrite selection screen 56 shown in FIG. 11 (step S10). On the rewrite selection screen 56, an update content display unit 56a, an update selection unit 56b, and a standby selection unit 56c are displayed. The user confirms the update content displayed on the update content display unit 56a, the position of the updated link, etc., and if the update is to be started immediately at that time, the user pushes the update selection unit 56b. If the update is performed later, the standby selection unit 56c is pushed.

  The CPU 10 determines whether or not rewriting is selected on the rewrite selection screen 56 based on the input signal from the external input I / F unit 22 (step S11). If it is determined that rewriting is selected (YES in step S11), the old version of the map data M stored in the map data storage unit 15 is rewritten with the rewriting data D2 (step S12).

  When the map data M is rewritten with the rewriting data D2, the CPU 10 returns the screen based on the operation history data 27 (step S13). The screen restoration will be described in detail. Based on the operation history data 27, the CPU 10 determines the screen displayed on the display 25 immediately before the map data M is rewritten and the operation history up to that screen. If necessary, processing corresponding to the operation up to the displayed screen is performed using the new map data M, and the screen corresponding to the processing is displayed as a return screen. For example, when data is rewritten in a state where the genre selection screen 52 as the search screen shown in FIG. 8C is displayed, the CPU 10 controls the image processor 20 to display the genre selection screen 52. 25. Since the genre selection screen 52 is a screen that cannot be rewritten by rewriting the map data M, the screen itself that was displayed on the display 25 immediately before the rewriting of the map data M is displayed as a return screen. In addition, when data is rewritten in a state where the golf course list screen is displayed as the search result screen, the CPU 10 displays the golf course list screen when searching using the new map data M on the display 25. To do. When there is an additional golf course or a deleted golf course by rewriting the map data M, a list screen that includes the additional golf course based on the new map data M or a list screen that reflects the deleted golf course is displayed. Is displayed as a return screen.

  Further, when the user scrolls the map screen 25a around the current position and a map screen 25a different from the current position around the vehicle C is displayed as shown in FIG. The front screen 27c stores the center coordinates C1 of the map screen 25a displayed as a result of the scroll operation. The image processor 20 reads the map drawing data 17 centered on the center coordinates C1 and displays a map screen 25a around the center coordinates C1 on the display 25. At this time, when the new road or the like is reflected in the new map data M, the new road or the like is highlighted as the changed portion 25d as shown in FIG.

  On the other hand, when the standby selection unit 56c is pressed on the rewrite selection screen 56 in step S11 (NO in step S11), the CPU 10 displays the rewrite selection screen 56 before displaying the rewrite selection screen 56 based on the operation history data 27. The screen returns to the state (step S14). For example, based on the operation history data 27, if the genre selection screen 52 shown in FIG. 8C is displayed before the rewrite selection screen 56 is displayed, the genre selection screen 52 is displayed on the display 25.

  When the screen is restored, the CPU 10 waits until the navigation system 1 is not in a predetermined state (step S15). At this time, the CPU 10 determines the currently displayed screen according to the operation history data 27 stored in the ROM 12. When the state of the navigation unit 2 at each time point does not correspond to the predetermined state (YES in step S15), a part of the map data M is rewritten with the rewriting data D2 (step S16).

  When the data is rewritten, the CPU 10 returns to step S1 and repeats the above processing until the main power of the navigation system 1 is turned off or the ignition is turned off.

According to the first embodiment, the following effects can be obtained.
(1) In the above embodiment, the navigation unit 2 receives the new version of the difference data D1 from the distribution server Sv. Further, when the difference data D1 is received, a screen for performing an input operation such as the search screen 51 or a screen for calling attention such as an intersection enlargement screen 54 is displayed on the display 25, or a touch panel operation is performed within a predetermined time. The rewrite selection screen 56 is displayed on the display 25 when the navigation unit 2 is in a predetermined state such as a broken state. For this reason, when there is a possibility that the user's labor may be wasted or the user may be stressed due to the interruption of the process currently being executed, the map data M is not forcibly rewritten. Since it is inquired whether or not to execute at the time, rewriting can be performed at a timing according to the user's request. Therefore, when rewriting the map data M, it is easy to use without giving stress to the user, and the usability of the navigation unit 2 can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that the second embodiment has a configuration in which only the processing procedure of the first embodiment is changed, and therefore, detailed description of the same parts is omitted.

  As shown in FIG. 13, the CPU 10 of the navigation unit 2 performs processing using the map data M (step S1) and makes an update inquiry (step S3). If it is determined that there is an update (YES in step S4), the difference data D1 is received from the distribution server Sv (step S5). When the acquisition of the difference data D1 is completed, the acquired difference data D1 is processed into the rewriting data D2 (step S6).

  Then, the CPU 10 waits for the processing process to end (step S7), and determines that the processing process has ended (YES in step S7), detects the state of the navigation system 1 (step S8). Then, it is determined whether or not the navigation system 1 is in a predetermined state (step S9).

  When the navigation system 1 is in a predetermined state (YES in step S9), the CPU 10 controls the image processor 20 to display the rewrite selection screen 56 on the display 25 (step S10). Then, based on the input signal from the external input I / F unit 22, it is determined whether or not rewriting is selected on the rewriting selection screen 56 (step S11). If it is determined that rewriting has been selected by the user (YES in step S11), a part of the map data M is rewritten using the rewriting data D2 stored in the update data storage unit 28 (step S12).

  On the other hand, if it is determined that rewriting is not selected (NO in step S11), the process waits until navigation system 1 is not in a predetermined state (step S15). When navigation system 1 is in a state other than the predetermined state (YES in step S15), CPU 10 rewrites part of map data M with rewriting data D2 (step S12). That is, the screen load based on the operation history data 27 is not performed after rewriting, so that the processing load on the navigation unit 2 can be reduced.

Therefore, according to the second embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.
(2) In the second embodiment, only when the navigation unit 2 is in a predetermined state, such as a state in which the search screen 51 is displayed or a touch panel operation is performed within a predetermined time retroactive from that point, The rewrite selection screen 56 is displayed, and when the rewrite is selected by the user, the map data M is rewritten. For this reason, it is possible to display the rewrite selection screen 56 and ask the user whether or not the data can be rewritten, so that the rewriting process can be performed smoothly.

In addition, you may change the said embodiment as follows.
In the above embodiment, the operation history data 27 includes the current state 27a, the input operation 27b, the transition destination screen 27c, and the date and time 27d. However, other data configurations may be used. For example, the processing module or application executed by the navigation unit 2 at that time may be stored.

  In the above embodiment, the state of the navigation system 1 is detected based on the operation history data 27 and it is determined whether or not the state is a predetermined state. In addition, the CPU 10 may determine whether or not a task started by a user input operation is being executed based on a task management program stored in the ROM 12.

  In the above embodiment, when the standby selection unit 56c is pushed on the rewrite selection screen 56, the navigation system 1 waits until the navigation system 1 is not in a predetermined state. In addition to this, when the standby selection unit 56c is selected, the startup update flag stored in the main memory 11 of the navigation unit 2 may be turned ON. When the navigation system 1 is activated, if the activation update flag stored in the main memory 11 is ON, data rewriting may be performed at the activation.

  In the above-described embodiment, the case where the navigation unit 2 receives the difference data D1 from the distribution server Sv has been described. However, the difference data D1 that needs to be processed or the rewritten data D2 that has been processed is stored in advance. The above-described processing may be performed when a storage medium such as is inserted into the navigation unit 2. Even in this case, as described above, when the navigation unit 2 is in a predetermined state, the rewrite selection screen 56 can be displayed to ask the user whether or not the data can be rewritten. It can be carried out.

  In the above-described embodiment, the navigation device is embodied in the navigation system 1 mounted on the vehicle C, but may be embodied in other navigation devices such as a terminal that can be carried by the user.

  2 ... navigation unit as navigation device, 10 ... state detection means, acquisition means, determination means, screen output means, switching means, CPU as return means, 15 ... map data storage section as map data storage means, 19 ... acquisition Communication device as means, 20 ... image output means, image processor as switching means, 25 ... display as display means, 26 ... operation history storage section as history storage means, 27 ... operation history data as history, 27b ... Input operation, 50 ... menu screen as search screen, 51 ... search screen as search screen, 52 ... genre selection screen as search screen, 54 ... intersection enlargement screen as alert screen, 56 ... selection screen Rewrite selection screen, D1 ... Differential data as update data, D2 ... Rewrite data to new map data Selection screen, M ... map data to select the Toggles to the user.

Claims (3)

In a navigation device that provides guidance using map data,
Map data storage means for storing the map data;
Data acquisition means for acquiring update data from the outside;
Processing means for generating new map data using the map data and the update data stored in the map data storage means;
Switching means for switching the map data stored in the map data storage means to the new map data generated by the processing means;
Determining means for determining whether or not the navigation device is displaying a predetermined display screen on the display means;
An operation history storage means for storing a history of user input operations on the navigation device up to the predetermined display screen as operation history data;
When the switching unit switches to the new map data in a state where the determination unit determines that the predetermined display screen is displayed on the display unit, the operation history is based on the new map data. A navigation device comprising: a return unit that performs processing according to data and displays a new screen corresponding to the processing as a return screen instead of the predetermined display screen that has been displayed. The navigation device according to claim 1, wherein
The predetermined display screen is a facility list screen displaying facilities searched by a user's search operation,
The navigation device according to claim 1, wherein the return means displays a new facility list screen when the facility is searched using the new map data as a return screen. The navigation device according to claim 1, wherein
The predetermined display screen is a map screen having a central coordinate at a position different from the current position by a user's scroll operation,
The operation history storage means stores the center coordinates of the map screen as the operation history data,
The navigation device according to claim 1, wherein the return means displays a new map screen based on the new map data centered on the center coordinates as a return screen.

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