JP3734022B2 - Navigation device and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a navigation apparatus and a program that can use only map data of an area including information useful to a user.
[0002]
[Prior art]
Conventionally, a navigation device having a route search and route guidance function uses map data stored on a CD, and a user has purchased a number of CDs corresponding to the area to be used. However, in recent years, a large-capacity storage device such as a DVD has been developed, and map data is stored in this device and installed in a navigation device. In this way, a wide range of data can be stored, and the user can cover all areas by purchasing one DVD.
[0003]
[Problems to be solved by the invention]
By the way, the navigation system is for assisting the user's driving, and the range of the user's action varies widely depending on geographical factors and personal factors. Therefore, a small database cannot satisfy the needs of many users. As a result, a database including all information is desired, and the DVD is used as a storage device that can respond to it, and the capacity of the database has been increased. However, as the use of DVD increases the capacity of the database, the royalty increases the price. A database that contains all the information contains information that is either useful or not useful to the user, and the user must pay for the information that is not necessarily needed by the user. Data will be expensive. In addition, the map data provider also has a problem that the map data is expensive and the sales channel cannot be expanded.
[0004]
[Means for Solving the Problems]
The present invention is to solve the above-mentioned problems, and it is possible to use only an area containing useful information for the user so that the map data usage fee can be reduced, and the map data provider can expand the map data usage area. The purpose is to do so.
[0005]
To this end, the present invention provides a navigation device that performs navigation processing based on stored map data, a storage unit that stores map data, a setting unit that sets a part of the map data as an open area, and the storage unit Search means for searching for a route to the destination based on map data inside and outside the open area stored in, and whether a road on the route searched by the search means is in the open area And a control means for warning when there is a road outside the open area.
Further, the present invention provides a program for controlling a navigation device that performs guidance based on stored map data, and sets a part of the map data as an open area, based on map data inside and outside the open area. A step of searching for a route to the input destination, a step of determining whether a road on the searched route is in the open area, and a warning when there is a road outside the open area. And
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a navigation system of the present invention, and FIG. 2 is a diagram for explaining map data stored in an information storage device.
The information storage device 3 is a large-capacity storage device such as a DVD. For example, the map data of the whole of Japan, the map data of the whole of Europe, such as all the map data that the user would normally use, restaurants, gas stations, etc. Property information, that is, facility data, search data used for route search, guide data used for route guidance, and the like are stored. The navigation device 1 includes a central processing unit, an input device, a position detection device, an output device, and the like. The central processing unit has all navigation programs such as a program for performing processing based on the flowchart of this embodiment, and data for the program. When the destination is input by the input device, the map data of the information storage device 3 is read out. The route from the current location detected by the position detection device or the starting point input by the input device to the destination is searched and guided by the output device. The output device includes a display and a speaker, and can provide guidance by display and voice, and can guide the destination and the like by voice and display.
[0007]
In the navigation device of the present invention, the map database stored in the information storage device 3 is opened only in an area according to the user's wish (can be used in the navigation device), and other areas cannot be accessed. The usage fee is determined according to the available area. Charges according to the area, for example, categorize the area size as large, medium, or small, and determine the usage charge according to one of them, adding a weight to the charge for each area, and the total charge for the selected area There may be various modes such as simply determining the fee based on the number of areas as a uniform fee for each area. For example, when the map data stored in the information storage device 3 is divided into areas A, B, C... As shown in FIG. In addition, if the number of areas is n as one area unit α, the usage fee is determined as nα. Further, when setting the usage fee for each area, the usage fee may be set according to the amount of map data or the area in each area.
[0008]
In addition, when a navigation device is newly purchased and a predetermined area can be selected in advance according to the purchase price (for example, three European countries can be selected), after purchasing the navigation device, the user can select any area. When is selected, the map data of the area is released. The purchase amount of the navigation device may be set according to the area amount that can be used first. For example, the amount is set according to the size of the area (selectable from seven countries), medium (selectable from five countries), and small (selectable from three countries). Thereafter, when the navigation device is frequently used even outside the area that is first available to the user and it is desired to further expand the area from the area selected first, the area release process shown in FIG. 4 is performed. In addition, when the navigation device is purchased, the purchase amount of the navigation device does not include the purchase amount of the map data. After purchasing the navigation device, the user can purchase any area based on the area release process shown in FIG. Also good.
[0009]
In such a system, it is necessary to prevent the map data from being used illegally. Therefore, in the present invention, the navigation device itself has a combination of a hardware-specific serial number (for example, a manufacturing number) of each navigation device and a disk number (map data version number) storing map data mounted on the navigation device. Unique identification information (ID) is generated. This ID is generated by a central processing unit in the navigation device. For example, when a navigation device has a function f, the device serial number is n, and the map data version number is m,
ID = f (n, m)
Thus, the ID is generated in the central processing unit. Here, if the fee is determined by the area size, the desired area size s is sent to the center together with this ID. The navigation device has area input (setting) means, and the area size is input by this input means. In addition, the area input means may input the area size such as large, medium, small, or ○ country, and when the user sends the identification number to the center, for example, “Germany, France, Belgium” Thus, an area may be designated.
[0010]
A function g is prepared on the center side, and from this ID and area size s,
k = g (ID, s)
A key code (map data access right information) is generated. The center (processing device arranged in the center) has means for acquiring the ID and area size generated by the navigation device, and also has means (central processing device) for generating a key code from the acquired ID and area size. ing. In addition, the center stores a charging method (credit, etc.) for the user, and has a means (central processing unit) for executing a payment settlement according to the charging method and the key code, and the generated key code Is sent to the user, billing processing is executed.
[0011]
The key code includes area size information. When the key code is input to the navigation device 1, the map data is released by the program read into the central processing unit. For example, when a key code is used as an area size release key, when a key is input to the navigation device, the screen shifts to an area selection screen, and the user can select an area (for example, three countries). Opened. When the key code is used as a release key for the area input by the area input means, when the key is input, the input area is canceled in the navigation device.
[0012]
By adopting such a system, even if the disks have the same version number, the map data cannot be used because the serial number is different if the device is different. The area expansion process can be performed at any time during the process of using the disk. When a new disk is purchased, the key code is generated again by the above-described method.
[0013]
In order to perform such processing, the navigation device is provided with an area enlargement menu screen as shown in FIG. 3, and when an area selection is selected here, for example, the device set on the flash ROM The ID is automatically generated by reading the serial number and the disk number of the information storage device. When the key code input is selected on this menu screen and the key code sent from the center is input, the corresponding area size is specified from the key code, and usable map data is released.
[0014]
Furthermore, when the center manages the identification number of the navigation device, the map data version number, etc., and transmits the user ID (which may not be related to the identification number or version number) and the area size from the user, the user ID at the center The center management may be performed such that a key code is generated by searching for an identification number and a map data version number corresponding to the navigation device. The center stores and manages which area of the map data is currently being used by a user (when the user pays a fee). Transmission), the user may be actively prompted to select (especially in the case of area size).
[0015]
Next, the area release process in the system of the present invention will be described with reference to FIG.
First, the area expansion menu screen of the navigation device is opened and area selection is selected (step S1), and the navigation device generates an ID from the hardware serial number and the data disc version number and displays it on the screen (step S2). . Next, the user informs the center of the displayed ID and the desired area size (step S3). These pieces of information can also be transmitted to the center by communication when the navigation device includes a communication means. On the center side, the navigation apparatus ID, billing method, and desired area size are acquired (step S4), and a key code is generated from the ID and area size (step S5). The generated key code is sent to the user, and the user who receives the key code opens the area enlargement menu screen (step S6) and inputs the key code (step S7). The navigation device specifies the area size from the input key code and releases the map data (step S8), transitions to the selection screen for the area to be used from the opened area size, and releases the selected area. . In this cancellation process, it is assumed that the area size is included in the key code, but if the key code contains information about a specific area (eg Germany, France, etc.), it will be specified when the key code is acquired. The released area will be released.
[0016]
In the above example, the data exchange between the navigation device and the center is performed manually. However, by using the server on the Internet or the customer server as the center, the area can be used more easily. Can be selected. Also, if the user owns the same navigation device and wishes to use the same disc between the devices, a restriction such as “up to 2 or 3” is provided, and within that range If so, map data may be provided free of charge. At this time, it is possible to retrieve the past purchase history by sending the first ID to the center, and the center side can take such measures by looking at the purchase history.
[0017]
In the above description, the navigation device and the center or server communicate with each other to exchange information. However, the card that stores the area size and map data access right information corresponding to a specific area is sold. A specific area may be opened by inserting a card purchased by the user into the navigation device. At this time, the navigation device includes a card slot, and when a card is inserted, map data access right information such as a key code is read, and map data corresponding to the area is released. The card seller creates a key code from the identification information of the device taught by the user and stores it on the card. If the navigation device user identification information and the like are registered in the host computer on the card seller side, the card can be easily created. In addition, if the navigation device is configured so that the map data access right information is taken in, it can be changed as appropriate.
[0018]
In addition, after the user purchases the navigation device, some or all of the map data can be used for a certain period, and the map data cannot be accessed after a certain period, and the above-mentioned data access method (area release process) is used. Thus, the map data of the desired area may be released by the user. At this time, the navigation device has a clock or acquires time information from a GPS connected to the navigation device, and measures a time period such as one week. With this configuration, the user can obtain a trial period and select an area that the user actually wants to use during that period.
[0019]
By the way, as shown in FIG. 5, the current map database of Europe is divided into four regions of France, the Netherlands, Belgium, Luxembourg, Germany, Switzerland, Austria, and Italy. Therefore, depending on the user's action range, it is necessary to purchase two or three CDs. For example, a person living in Luxembourg, Belgium, needed to purchase a map of Germany or France. Even in that case, the user needs a map of East France or West Germany, not all France or all Germany. Of course, it is technically possible to create a CD with Belgium plus West Germany and East France, but it is not practical because of fixed costs and distribution issues. This problem has been largely solved by increasing the data capacity of the DVD, but the database loyalty has increased accordingly, and the user has to pay loyalty that is not likely to go by car.
[0020]
Therefore, in this embodiment, conditional access (conditional access) is performed. Conditional access means that only a part of a large-capacity data medium (DVD) containing all data can be accessed by software, and as a result, the right to use is purchased only for the area necessary for the user. Is possible.
[0021]
The area selection method for this will be described below.
FIG. 6 is a diagram showing an example in which a user can designate an arbitrary use area by a rectangle.
As shown in the figure, a rectangle (rectangle or square) A having a predetermined size is prepared, the user can freely move the position, and the use area of the map data is set according to the position. This area is set by an input device. The data usage fee is determined according to the specified rectangular size. Data usage fees may be determined by changing the rectangular aspect ratio and changing the size. In addition, the charge may be changed depending on the area, considering the road conditions and congestion in Europe, and the charge may be changed depending on what area is included.
[0022]
Note that the user may set a map data usage fee in advance, present a rectangle of a predetermined size according to the preset fee to the user, and set it as an open area. In addition, when the user sets the map data usage fee in advance and the user decides the rectangular size freely and sets the map data open area, an upper limit is set for the area that can be expanded by the preset fee. You may do it. That is, when a usage fee of a certain amount is set in advance, even if the rectangle is expanded, it is prevented from expanding beyond a certain size. The size of the rectangle is determined by inputting an instruction to drag a diagonal line of the rectangle, for example, with an input device. With respect to the rectangle in which the aspect ratio is set in this way, the open area is set by the user freely specifying the position.
[0023]
FIG. 7 is a diagram illustrating an example in which the entire area is divided in advance and a use area is selected from the area.
As shown in the figure, the entire data range is divided in advance into a plurality of rectangles having different sizes and aspect ratios, and a predetermined number, for example, five rectangles, is selected from the fees to be paid. In this case as well, each usage fee may be set for each rectangle, and the number desired by the user may be purchased according to the fee to be paid. At this time, the usage fee set for each rectangle may be displayed on the map at the time of area selection, and the usage fee for each rectangle may be displayed to the user in an easy-to-understand manner. Although it is possible to divide the use area into curved shapes, circles, etc., it takes time for the navigation system to process within the restrictions, and there are problems with responsiveness. Is desirable.
[0024]
FIG. 8 is a diagram showing an example in which an area can be divided and selected by the boundary of administrative division units.
As shown in the figure, a country with a small area is divided by a country unit, and a country with a large area is divided by an appropriate administrative division unit, so that an area desired by the user can be selected according to the fee paid. In order to simplify the navigation program, it is possible to use a method that does not use detailed administrative divisions but all countries. In this case as well, if the boundaries of administrative divisions are used as they are, an area such as a curved shape is generated, and the response of navigation processing cannot be secured as described above. It is desirable to approximate
[0025]
Next, an example of limiting the area to be used as much as possible in the flow of executing the navigation process, determining the area as downstream as possible, and selecting the area to minimize performance degradation due to the introduction of the function of the present invention. Is described below.
[0026]
In conditional access that provides the user's advantage of paying only the necessary range of charges, the navigation system must perform various processes within the usage area constraints, which can increase the processing load and reduce performance. There is sex. If the performance is significantly reduced, the merchantability will be reduced. Therefore, by determining the area to be used as far as possible in the flow of execution of the navigation process, the influence of the conditional access on the navigation process will be as much as possible. Try to hold it down. In this case, we will encourage users to purchase a wider range of copyrights by teaching users that they don't need to provide the contents of the information, rather than simply imprisoning data in areas that were not selected. To.
[0027]
FIG. 9 is a diagram showing an example of warning before the property information is displayed for guidance.
The search for the destination set by the user is performed from the point data managed by the coordinates in the normal process, that is, not the purchased area but all the data (step S11), and the point (property) is determined as the destination. Is performed (step S12). Next, it is determined whether or not the confirmed point is within the purchased area (step S13). If it is within the purchased area, the property name, address, telephone number, etc. of the destination are displayed, and the button “View Map” or “Go Here” is prompted to select (Step S14). Accordingly, a destination is set or a map is displayed (step S15). In step S13, if it is not within the purchased area, the screen will indicate “The selected point is outside the area you purchased” or “Please call 0120-123456 (24 hours a day, 7 days a week)” (Step S16) and prompts the user to purchase a wide range of copyrights. The user knows that the destination set from the warning screen is out of the area, and repeats the process of step S11.
[0028]
In this way, the destination search is performed as it is, and when it is finally limited, the inside / outside judgment of the area is performed, so that the performance degradation is minimized and the information is in the database. , Can encourage purchases. Depending on the user, there is a possibility that the user can determine whether the purchase is within or outside of the area purchased at the time of setting the destination, so that redoing can be performed quickly. In such a case, a warning such as step S16 may be issued.
[0029]
Next, do the destination search as it is, display some or all of the destination property information and warn you that the data is locked to let you know that the information is in the database, An example of prompting purchase will be described with reference to FIGS.
FIG. 10 is a diagram showing an example of displaying a part of the property information and giving a warning, and is the same as in FIG. 9 except that a part of the property information is displayed and an OK key desired to be released is displayed .
First, a destination is input and a normal destination search process is executed using all data (step S21). Next, a point (property) confirmation process is performed from the coordinate data of the destination (step S22), and it is determined whether or not the point is within the purchased area (step S23). If it is within the purchased area, the property name, address, telephone number, etc. of the destination are displayed and prompted to select with the “view map” or “go here” button (step S24). When the operation is performed, destination setting or map display is performed (step S25). In step S23, if it is outside the purchased area, a part of the property information such as the property name and address of the destination is displayed and “Data is locked. Release is 0120-123456”. Then, an OK key for accepting this is displayed (step S26). When the user operates the OK key, the process returns to step S21 and the destination setting process is performed again. A user who wishes to release the data lock obtains the key code by the method described above and releases the data lock.
[0030]
FIG. 11 is a diagram showing an example of warning after displaying all the property information.
First, a normal destination search process is executed by inputting a destination and using all data (step S31). Next, a point (property) confirmation process is performed from the coordinate data of the destination (step S32), and the name, address, telephone number, etc. of the destination are displayed (step S33). It is determined whether it is within (step S34). If it is within the purchased area, destination setting or map display is automatically performed (step S35). In step S34, if it is outside the purchased area, all the property information such as the property name and address of the destination are displayed, and “Data is locked. Release is 0120-123456”. An OK key for accepting this is displayed (step S36). When the user operates the OK key, the process returns to step S33 and the destination setting process is performed again. Note that when the OK key is operated, a request for releasing the data lock may be automatically transmitted to the center.
[0031]
In the above embodiment, the destination setting has been described as an example. However, the present invention is not necessarily limited to the destination setting. The map display device also searches for a map around the point after searching for the point (facility). Needless to say, it can be applied to uses other than the destination setting such as displaying. In this case, when the found facility is outside the open area, a warning is given that it is outside the open area.
[0032]
By the way, if the inside / outside judgment of the area is performed during the search process, not only the performance up to the end of the search is deteriorated but also an absurd route may be searched due to the adverse effect of the area restriction, so the area restriction is ignored. It is desirable to search in the state, and to determine whether the area is inside or outside the result.
[0033]
FIG. 12 is a diagram showing an example in which the area check is performed after the first voice guidance after the search is completed. In this example, destination setting and route search are all performed for all data, and an area check is performed at the guidance stage.
First, a normal search process is performed (step S41), and guidance is started (step S42). Next, it is determined whether there is even one road outside the area on the route (step S43). If there is no road, guidance is started as it is (step S45). If there is even one road outside the area, “I will pass the road outside the area. Map display and guidance will not be performed outside the area. Please purchase data at 0120-123456 (24 hours a day, 7 days a week)” A screen warning like the following will be displayed, and a voice warning will be given, such as “You will pass the road outside the area. Map display and voice guidance will not be performed outside the area. S44), guidance in step S45 is started.
[0034]
FIG. 13 is a diagram illustrating an example in which an area check is performed after the search is completed.
First, normal search processing is performed (step S51), and then it is determined whether there is even one road outside the area on the route (step S52). If not, guidance is started as it is (step S54). If there is even one road outside the area, “I will pass the road outside the area. Map display and guidance will not be performed outside the area. Please purchase data at 0120-123456 (24 hours a day, 7 days a week)” Is displayed, and a warning with a voice such as “I will pass the road outside the area. Map display and voice guidance will not be performed outside the area. Please be careful.” (Step S53) ), The guidance in step S54 is started.
[0035]
Next, a screen display method when the result of the route search based on all data as described above results in including a part outside the area will be described below.
FIG. 14 is a diagram showing an example of determining inside / outside of a data area to be read at the time of data reading.
When a map display request is made (step S61), the system determines whether the data to be read (searched route data) is within the area (step S62). If it is within the area, it is read as usual (step S63), and data outside the area is not read (step S64). Next, a map display is performed based on the read data (step S65). In this manner, the inside / outside determination of the area is performed at the stage of reading data from the map data storage means (DVD), and only the map data in the opened area is read into the central processing unit. Further, all the map data is read from the map data storage means (DVD) into the central processing unit, the inside / outside determination of the area is performed at the stage of outputting the guidance information to the display means, and only the map in the open area is outputted to the display means. It may be. Further, the map display request may be in any case such as a map display after route search or a case where a map display is simply requested without setting a route.
[0036]
FIG. 15 is a diagram illustrating an example in which guidance information is provided only when the vehicle position is within an area.
After the route search with all data is performed, it is determined whether or not the vehicle position is within the area (step S71), and if it is within the area, a normal guidance screen is displayed (step S72). If it is out of the area, only the arrow indicating the straight line distance to the destination and the straight line direction of the destination is displayed without displaying the map (step S73). Further, either the linear distance to the destination or the direction of the destination may be output by voice or display.
[0037]
FIG. 16 is a diagram showing an example of controlling whether guidance is performed by determining the inside / outside area of the coordinates of the speech point (voice guidance point) or not.
An utterance point for voice guidance is specified (step S81), and it is determined whether the utterance point is within the area (step S82). If the utterance point is within the area, the utterance (voice guidance) when the vehicle position arrives at the utterance point. (Step S83). If the utterance point is outside the area, nothing is done even if the own vehicle position arrives at the utterance point (step S84).
[0038]
As described above, the guidance information based on the map data of the open area and the guidance information based on the map data other than the open area are output differently, and the user can be prompted to expand the area.
[0039]
FIG. 17 illustrates the processing flow of FIG. 16, in which a rectangular frame indicates an area boundary, and guide routes are searched as R1, R2, R3, R4, R5, R6, and routes R2, R3, Assume that R4 is outside the area boundary and A, B, C, D, E, and F are utterance points. At the utterance point A of the route R1, guidance is "300m ahead right", and voice guidance is not performed at the utterance points B, C, and D of the routes R2, R3, and R4. At the utterance point E on the route R5, guidance “300m ahead left” is given, and at the utterance point F, guidance “soon to the left” is given. In the inside / outside area determination of the guidance point on the route, not only whether or not the voice utterance point is in the area, but also an enlarged view of the intersection based on the inside / outside determination of the display output point (such as 300 m before the guidance intersection) of the enlarged intersection map. You may make it perform control of displaying / not displaying.
[0040]
In addition, as a result of searching for a route from the current position to the destination, if there is an area outside the open area, a route that does not include roads outside the open area by further searching using map data only in the open area ( The second route) may be searched and route information regarding the route may be presented to the user. For example, as shown in FIG. 18, the route R1 is presented as the optimum route in the search using all data from the current location (departure location) S to the destination D. Because the route guidance is restricted, detailed guidance cannot be received. Therefore, by searching using the map data only in the open area, when the second route R2 is searched, the second route R2 that is not optimal and can receive detailed guidance in the open area is not optimal. The user can select and compare the route R2. As the route information, the entire searched route may be displayed, or information such as a road name and a high-speed fare along the searched route may be displayed.
[0041]
In each of the above embodiments, the open area of the map data is specified in an area such as a rectangle, a country unit, or an administrative division unit. However, according to the usage fee, the map type (wide area map, detailed map) is used. , City maps, etc.) and service contents (only map display, guidance etc.) may be specified. For example, it is possible to set an open area according to the user's preference, such as displaying only in France, providing guidance in Germany, and displaying a city map in Italy.
[0042]
【The invention's effect】
As described above, according to the present invention, the search is performed in a state ignoring the area restriction, and the inside / outside area determination is performed on the search result. Accordingly, an absurd search can be prevented. Further, after the search, even if there is no road on the route in the purchased area, the storage medium (DVD) owned by the user may be notified that the road data is included. Yes, it can motivate purchases in further areas.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a navigation system according to the present invention.
FIG. 2 is a diagram illustrating a map area to be used.
FIG. 3 is a diagram illustrating an area expansion menu screen.
FIG. 4 is a diagram illustrating an area release process.
FIG. 5 is a diagram for explaining a map database of Europe.
FIG. 6 is a diagram illustrating an example in which a user can designate a use area as a rectangular area;
FIG. 7 is a diagram illustrating an example in which an entire area is divided in advance and a use area is selected from the divided areas.
FIG. 8 is a diagram showing an example in which an area can be divided and selected by administrative divisions.
FIG. 9 is a diagram showing an example of warning before property information is displayed as guidance.
FIG. 10 is a diagram illustrating an example in which a part of the property information is displayed and a warning is issued.
FIG. 11 is a diagram showing an example of warning after displaying all the property information.
FIG. 12 is a diagram illustrating an example in which an area check is performed after the first voice guidance after the search is completed.
FIG. 13 is a diagram illustrating an example in which an area check is performed after the search is completed.
FIG. 14 is a diagram illustrating an example of determining inside / outside of a data area to be read at the time of data reading;
FIG. 15 is a diagram illustrating an example in which guidance information is provided only when the vehicle position is within an area.
FIG. 16 is a diagram illustrating an example of controlling whether guidance is performed by determining inside / outside of an utterance point coordinate area or not.
FIG. 17 is a diagram for explaining the processing flow of FIG. 16;
FIG. 18 is a diagram for explaining an example in the case where a searched route is outside the open area, and is further searched using map data only in the open area.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Navigation apparatus, 2 ... Center, 3 ... Information storage device.

Claims (6)

In a navigation device that performs navigation processing based on stored map data,
Storage means storing map data;
Setting means for setting a part of the map data as an open area;
Search means for searching for a route to the destination based on map data inside and outside the open area stored in the storage means;
Control means for determining whether or not a road on the route searched by the search means is in an open area, and warning when there is a road outside the open area;
A navigation device characterized by comprising:   2. The navigation apparatus according to claim 1, wherein when the control unit determines that a road on the route searched by the search unit is outside an open area, the control unit warns that no guidance is provided on the road. .   The navigation device according to claim 1 or 2, wherein the control unit performs guidance for enlarging an open area together with a warning.   4. The navigation device according to claim 1, wherein the warning is performed by screen display or voice. It further comprises display means for displaying route information,
When the control means determines that the road on the route searched for by the search means is outside the open area, the search means is configured based on the map data in the open area set by the setting means. Search for a second route to the ground,
The navigation device according to claim 1, wherein the control unit performs control so as to output route information regarding the second route. In a program for controlling a navigation device that performs guidance based on stored map data,
Setting a part of the map data as an open area;
Searching for a route to the input destination based on map data inside and outside the open area ;
Determining whether a road on the searched route is within an open area and warning when there is a road outside the open area ;
A program storable in a computer-readable storage means .

Images