JP4907889B2 - Navigation device and method and program thereof - Google Patents

Description

  The present invention relates to a navigation technique that displays a passage or a back road in addition to a guidance route, and more particularly to a navigation technique that can be displayed by focusing on a passage or a back road related to the guidance route.

  In general, in navigation devices such as in-vehicle use, a point search is performed from a point database recorded on a storage medium such as a CD-ROM or a point on a map arbitrarily selected by a user, and a desired destination is designated. To do. Then, the vehicle position is detected as the current location, and a guidance route from this location to the destination is searched.

  When searching for a guidance route, while reading road data from a storage medium such as a CD-ROM, the route search is performed using a route search algorithm such as Dijkstra method, and from the detected vehicle position to the specified destination The cost is determined from the plurality of route candidates, and an optimum route is calculated based on the road data to generate route data for the guide route.

  Subsequently, the guidance route toward the destination and the position of the vehicle are superimposed and displayed on the display, the guidance route is guided based on the route data, and the direction guidance is performed by the synthesized voice from the speaker. By using such a navigation device, the user can reliably reach the destination from the departure place without following the guidance route.

Various functions are added to the above-described navigation device. For example, a device in which a detour is set for a guidance route as in the technique described in Patent Document 1 is known. In this conventional example, the detour calculation unit calculates the detour, but the detour calculation unit lowers the evaluation value for the link on the previous route so as not to reset the previous guidance route, and calculates the route. It is supposed to be.
JP-A-8-233589

  By the way, although the detour calculated in the above-mentioned patent document 1 includes a bypass and a back road as a road that avoids the guidance route, the roads used for the bypass and the back road are statistically determined to some extent. Therefore, avoiding the waste of calculating as a detour until each way and back road, road information used as a way or back road in advance, that is, information of the way or back road is registered in the map database incorporated in the navigation device in the past More proposed. In this navigation device, it is possible to clearly show the passage or back road on the display screen by simply calling the information on the road or back road from the map database. Therefore, it is not necessary to calculate the escape path or the back road by calculation processing, and the exit path or the back road can be immediately presented to the user.

  However, the following problems have been pointed out in the conventional navigation apparatus in which the information on the escape path or the back road is stored in advance. That is, while it is not necessary to calculate the loopholes and back roads, all the loopholes and back roads are displayed without exception. For example, in FIG. 6, the guidance path is indicated by a thick solid line R, and the exit path or back path is indicated by thick two-dot chain lines A to H. V is a mark indicating the vehicle position. At this time, among the escape paths or back roads A to H, A to D are connected to the guidance route R again when passing there, but E to H are gradually separated from the guidance route R when passing there. In other words, the escape roads or back roads E to H are completely unrelated escape roads and back roads when heading to the destination.

  As described above, in the conventional navigation device, there are cases where a loop-away path or a back path unrelated to the guidance path is clearly shown at a place far from the display of the guidance path. As a result, the user often feels annoyed, leading to a decrease in the visibility of the display screen.

  The present invention has been proposed to solve this problem, and the purpose of the present invention is to display only a passageway and a back road to the destination, thereby simplifying the display screen and improving visibility. An object is to provide a navigation device, method, and program that are improved and easy to use.

In order to achieve the above-described object, the invention of claim 1 includes route candidate extraction means for extracting a plurality of guide route candidates from a departure place to a destination, and a plurality of guide route candidates extracted by the route candidate extraction means. A guide route calculation means for calculating a guide route from a departure point to a destination as a calculation target and selecting a guide route to be guided from among the plurality of guide route candidates, and the guide route calculated by the guide route calculation means In a navigation apparatus having guidance route guidance means for guiding a road, a road used as a passage or a back road is recorded in advance as a passage or a back road, and the route candidate extraction means includes a plurality of guidance route candidates. when extracting, the loophole or back road information was recorded in a plurality of navigation route candidates and the loophole-back road information storage means for the path candidate extracting means has extracted The combined can, the in loophole-back road loophole information has been recorded in the storage means or back roads, the matched loophole or back roads and a plurality of navigation route candidates said path candidate extracting means has extracted, loophole or back road to be displayed a display target road selection means loopholes or back roads selected as a road, a display target road storage unit loopholes or back roads displayed road selecting means of the loopholes or back road stores the displayed roads selected loophole or back roads, the It is characterized by comprising display means for displaying the exit road or back road display target road stored in the exit road or back road display target road storage means in a form different from that of the guide route and together with the guide route .

The invention of claim 4 captures the invention of claim 1 from the viewpoint of the method, and uses a computer to extract a plurality of route candidate candidates from the starting point to the destination, A guide route for calculating a guide route from a departure point to a destination using a plurality of guide route candidates extracted in the route candidate extraction step as a calculation target, and selecting a guide route to be guided from the plurality of guide route candidates In a navigation method including a calculation step and a guidance route guidance step for guiding the guidance route calculated in the guidance route calculation step, a passage / back road that pre-records a road used as a passage or back road as a passage or back road an information storage step, when extracting a plurality of navigation route candidates in the path candidate extraction step, the path candidate extraction step Butt extracted with a plurality of navigation route candidates the loophole-back road information storing hand From been loophole or backstreets information in step, in a loophole or back roads are recorded in the loophole-back road information storing step, wherein Pathway or back road display target road selection step for selecting a loopway or back road that matches a plurality of guidance path candidates extracted in the path candidate extraction step as a road to be displayed on the road or back road, and display target of the loop or back road a display target road storage step loopholes or back roads stores display object road of the selected loophole or back roads in the road selection step, the display object of the loophole or loophole stored in back roads to be displayed road storage step or back roads road, displayed road display step of displaying together and the guide route in a different form from that of the guide route It is characterized in that it comprises a.

Further, the invention of claim 5 relates to the navigation apparatus and method according to the inventions of claims 1 and 4 , which are grasped from the viewpoint of a program, and from a starting point to a destination by using a computer. A route candidate extraction function for extracting a plurality of guide route candidates, and a plurality of guide route candidates extracted by the route candidate extraction function to calculate a guide route from a departure point to a destination , and the plurality of guide route candidates In a navigation program that causes a computer to implement a guide route calculation function for selecting a guide route to be guided from among the guide routes and a guide route guide function for guiding the guide route calculated by the guide route calculation function , Pathway / backway information storage function for recording roads to be used in advance as loopholes or back roads, and the route candidate extractor When extracting a plurality of navigation route candidates in capacity, against the path candidate extraction function multiple navigation route candidates and the loophole-back road information has been loophole or back road information From similar memory function extracted by the loophole -Of the loops or back roads recorded by the back road information storage function, the roads or back roads that match the plurality of guide route candidates extracted by the path candidate extraction function are selected as the roads to be displayed for the loops or back roads. A display target road selection function of the escape road or back road to be displayed, a display target road storage function of the escape road or back road that stores the display target road of the escape road or back road selected by the display road selection function of the escape road or back road, and the escape road or back road to be displayed road storage function similar to the display target roads stored loophole or back roads, and the guidance route and co in different forms from the guide route It is characterized in that to realize the display target road display function for displaying, to a computer.

In the first, fourth , and fifth aspects of the invention having the above-described configuration, the target road of the exit or back road is selected from a plurality of guide path candidates extracted when calculating the guide path when displaying the exit or back road. It is possible to select only those that fall under and display the guidance route and the target road of the exit or back road in different modes . For this reason, a path or back road that is unrelated to the guidance path is not displayed as a path or back path because it is out of the guidance path candidate in the first place. That is, only the exit path or the back path related to the guide route toward the destination is displayed. Moreover, it becomes possible to distinguish both clearly. As a result, the display screen is extremely simple and the visibility is greatly improved.

According to a second aspect of the present invention, in the navigation device according to the first aspect, when the current position of the moving body approaches within a predetermined distance from the starting point of the road to be displayed on the path or the back road, the display means Alternatively, the display target road of the back road is displayed.

  In the invention of claim 2, since the current position of the moving body approaches the starting point of the target road of the escape road or the back road within a predetermined distance, the escape road or the back road is displayed. It is possible to make it appear in a timely manner, and it is possible to strongly appeal the existence of a passage or a back road. Until the starting point of the target road of the escape or back road is approached within a predetermined distance, the escape road or back road of that part is not displayed. From an unnecessary point of view, unnecessary loopholes or back roads are not displayed. Therefore, the display screen is further simplified, which can contribute to improving the visibility of the display screen.

According to a third aspect of the present invention, in the navigation device according to the first or second aspect , when the moving body deviates from the existing guidance route, the route candidate extraction unit extracts a new guidance route candidate, and the guidance route The calculating means recalculates the guidance route, and the route selection means for the escape route or the back road is selected based on the information of the escape route or the back road stored in the escape / back road information storage means. From the new guidance route candidates extracted by the extraction means, the one corresponding to the target road of the exit road or the back road is selected.

In the invention of claim 3 , when the route is deviated from the guide route, the route candidate extraction unit extracts a new guide route candidate and the guide route calculation unit recalculates the guide route. The target road selection means for the back road selects a route corresponding to the target road of the escape road or the back road from the new guidance route candidates extracted by the route candidate extraction means. It can be stored and displayed by the display means .

  As described above, according to the navigation device, method, and program of the present invention, only a route corresponding to the target road of the exit road or the back road is selected from the plurality of route candidates extracted when calculating the guidance route. Since it is displayed, it is possible to display only the exit path and the back road related to the guide route, the display screen becomes extremely simple, the visibility is improved, and good usability can be obtained.

  Next, the best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be specifically described with reference to the drawings. In addition, although this embodiment is realizable by controlling the computer provided with the peripheral device by the program, the realization aspect of the hardware and program in this case can be changed variously, and also for map data and route calculation The algorithm can also be selected as appropriate.

  In addition to the navigation apparatus and method, the present invention can be grasped as the above-mentioned program and a computer-readable recording medium recording the program. This program is a physical program such as a CPU and various chipsets incorporated in the navigation apparatus. The effect of this invention is implement | achieved by utilizing a processing apparatus.

[1. Constitution〕
[1-1. Overall configuration)
Each element of this embodiment is demonstrated using the functional block diagram of FIG. Each element includes an absolute position / orientation detection unit 1, a relative orientation detection unit 2, a vehicle speed detection unit 3, a main CPU and its peripheral circuit 4, a memory group M, an output unit 10, and an input unit 11. A disk control unit 12, an FM multiplex reception and processing unit 13, and an optical / beacon reception and processing unit.

  Among them, the absolute position / orientation detection unit 1 receives the GPS radio wave transmitted from the GPS satellite with an antenna, a receiver, or the like, so that the position of the vehicle that is the current location of the vehicle on which the present apparatus is mounted on the ground surface. This is the part that calculates absolute position coordinates and direction. The relative orientation detection unit 2 is a part that detects the relative orientation of the host vehicle using a gyro sensor or the like. The vehicle speed detection part 3 is a part which calculates the speed of the own vehicle by processing the vehicle speed pulse obtained from the own vehicle.

  Further, the main CPU and its peripheral circuit 4 are parts that serve as a control circuit for controlling the entire apparatus of the present embodiment. The memory group M is provided with ROM 5, DRAM 6, SRAM 7, and VRAM 8. Among these, the ROM 5 stores a BIOS, a boot-up program, and the like in advance, and is accessed by the main CPU and its peripheral circuit 4 when the apparatus is activated. The DRAM 6 is used for a work area and the like.

  The SRAM 7 is a non-volatile memory, and retains the memory contents by being backed up by a battery or the like even when the main power source of the apparatus such as an accessory power source of the own vehicle is turned off. In addition, the SRAM 7 plays a role of a target road storage means of a passageway or a back road, which is one of the features of the present embodiment. In other words, the link ID (road break) ID of the exit road or the back road is held. The VRAM 8 is a memory for performing video display on the output unit 10.

  The output unit 10 is a part that displays the searched guidance route, the escape route, the back road, and the like on the screen and notifies the guidance direction at the guide point on the guidance route. The input unit 11 is a part for the user to input various information such as commands and destinations to the apparatus using a remote controller, a touch panel, or the like. The user interface unit 9 is a user interface that connects the output unit 10 and the input unit 11 to the main CPU and its peripheral circuit 4 using an I / O control circuit, a driver, or the like.

  The disk control unit 12 is means for reading various data such as navigation data, intersection information, map data including roadway information / backway information road information, and the like from a database recorded on a disk such as a hard disk or a CD-ROM. The FM multiplex reception and processing unit 13 receives a FM broadcast wave of radio by switching a plurality of antennas according to the reception state, and obtains VICS information from this broadcast wave, an optical / beacon reception and processing unit 14 Is the part that receives the light / beacon signal and processes this signal.

[1-2. Role of main CPU and its peripheral circuits]
Further, the main CPU and its peripheral circuit 4 include a host vehicle position specifying unit 40, a destination specifying unit 41, a route calculating unit 42, a guidance control unit 43, a route candidate extracting unit 44, an exit road or back road target road selecting unit 45, It is constituted by a target road display section 46 for a loop-out or a back road.

  Among these, the own vehicle position specifying unit 40 is a means for specifying the own vehicle position by sequentially calculating the own vehicle position by combining GPS navigation positioning and autonomous navigation positioning. The destination designation unit 41 is a part for designating a destination input by the user via the input unit 11 as a destination.

  In the route search process, there are multiple route candidates between the location of the vehicle and the destination, so the cost is determined in consideration of the road rank and the number of left and right turns. The route is determined. Here, the route candidate extraction unit 44 reads out road information from a disk such as a CD-ROM using the disk control unit 12, and extracts a plurality of route candidates from the departure point to the destination based on the road information; Become.

  The route calculation unit 42 performs a route search using a route search algorithm such as Dijkstra method, and the destination specified by the destination specifying unit 41 from the own vehicle position specified by the own vehicle position specifying unit 40. This is a part for creating route data representing the guide route by calculating the guide route up to the above based on the map data. If the vehicle position deviates from the already calculated guidance route, the route candidate extraction unit 44 immediately extracts a new route candidate, and the route calculation unit 42 includes the newly extracted route candidate. The guidance route is recalculated.

  The guidance control unit 43 is a means for controlling the guidance guidance by determining elements such as a portion to be displayed on the guidance route and flashing emphasis, and using combined speech. Based on the map data read from the disk control unit 12, the vehicle position specifying unit 40, the destination specifying unit 41, the route calculating unit 42, the guidance control unit 43, and the route candidate extracting unit 44 are A navigation means for searching for a guidance route to a specified destination and guiding the guidance is configured.

[1-3. Characteristic part of this embodiment]
Subsequently, characteristic portions of the present embodiment will be described. The characteristic part of the present embodiment is a part obtained by adding a route or back road target road selection unit 45 and a road or back road target road display unit 46 to the route candidate extraction unit 44 and the SRAM 7.

  The target road selection unit 45 for the exit path or the back path is based on the information on the exit path or the back path from the disk such as a CD-ROM read out by using the disk control unit 12, and is selected from the route candidates extracted by the path candidate extraction unit 44. (If any newly extracted route is included), this is a part for selecting a route corresponding to the target road of the exit or back road. As already described, the link (road separation) ID of the target road of the escape road or the back road selected by the target road selection unit 45 of the escape road or the back road is stored on the SRAM 7.

  The exit road or back road target road display unit 46 is a part that displays the out road or back road target road on the output unit 10 in a manner different from the guidance route. Here, the guidance route is indicated by a solid line, while the target road of the exit road or the back road is indicated by a two-dot chain line. In addition, the timing at which the target road of the exit road or the back road is displayed is within a predetermined range with respect to the start point of the target road of the exit road or the back road where the host vehicle position specifying unit 40 specifies For example, when approaching within a radius of 700 m, this is displayed on the display screen of the output unit 10.

[2. Action)
Next, the operation of this embodiment will be described. FIG. 2 is a flowchart showing the selection and display processing of the target road of the exit road or the back road. First, in STEP1, the own vehicle position specifying unit 40 specifies the own vehicle position, and in STEP2, the destination specifying unit 41 specifies the destination. Subsequently, the route candidate extraction unit 44 extracts a plurality of route candidates from the departure point to the destination (STEP 3), and the route calculation unit 42 calculates the guidance route through cost determination and the like (STEP 4).

  Further, at the same time as performing cost determination at the time of route calculation, it is confirmed whether or not each route candidate extracted by the route candidate extraction unit 44 is a target road of an exit road or a back road (STEP 5). That is, if the route candidate corresponding to the escape road or the back road corresponds to the road of the escape road or the back road based on the information of the escape road or the back road, the target road selection unit 45 selects this (Yes in STEP 5). The link (road break) ID is held on the SRAM 7 (STEP 6).

  In FIG. 3, among the route candidates indicated by thick dotted lines, only A and B correspond to the target roads A to H of the exit road or the back road. As shown in FIG. 6, the target roads C and D of the exit road or the back road are connected to the guide route R, but are not route candidates in FIG. 3. This is that the target roads C and D are one-way in the direction opposite to the traveling direction of the own vehicle (specifically, the left direction in the figure for the target road C and the downward direction in the figure for the target road D). Is attributed.

  If the target road selection unit 45 of the exit or back road does not correspond to the target road of the exit or back road based on the information of the exit or back road, and if this is not selected (No in STEP 5), The link ID of the route candidate is discarded without being stored on the SRAM 7 (STEP 7).

  Subsequently, if the own vehicle position V specified by the own vehicle position specifying unit 40 is sufficiently away from the starting point of the target road of the escape road or the back road that is located closest to the vehicle position V, as shown in FIG. Or, the target road of the back road is not displayed.

  However, if the vehicle position V approaches within a radius of 700 m with respect to the starting point of the target road of the escape path or back road that is closest to the vehicle position V (Yes in STEP 8), as shown in FIG. The road display unit 46 displays the target roads A and B of the exit road or the back road with a two-dot chain line (STEP 9).

[3. effect〕
According to the present embodiment as described above, when the exit path or back road is displayed, it corresponds to the target road of the exit path or back path from among a plurality of route candidates (thick dotted lines in FIG. 3) extracted when calculating the guidance path. Only the A and B to be displayed are displayed, and the exit path or the back road that is unrelated to the guide route is not displayed in the first place. In addition, until the starting point of the target road of the escape road or back road is approached, the escape road or back road of that portion is not displayed at all, and therefore, unnecessary open roads or back roads are not displayed from the viewpoint of time. Therefore, as shown in FIG. 4, the display screen of the output unit 10 has a very simple configuration, and it is possible to easily identify a passage or a back road, and the visibility is greatly improved.

  Further, in this embodiment, since the vehicle position V approaches the target roads A and B of the exit road or back road, this is displayed, so the display timing of the exit road or back road is the presence of the exit road or back road. It is also suitable for strongly appealing. In addition, since the guidance route and the target road of the exit path or the back road are displayed in different modes, it is possible to clearly distinguish both.

  In this embodiment, when the route is deviated from the guidance route, the route candidate extraction unit 44 extracts a new route candidate, and the guidance route calculation means recalculates the guidance route. The unit 45 can select a new route candidate extracted by the route candidate extraction unit and corresponding to the new road or the target road of the back road. For this reason, the SRAM 7 holds this, and the target road display section 46 of the exit road or the back road can be displayed, and even when it deviates from the guidance route, a flexible response is possible.

[4. Other embodiments]
Note that the present invention is not limited to the above-described embodiment, and the shape, size, color, and the like can be appropriately selected and the display timing can be appropriately changed in the aspect of the target road of the exit road or the back road. . Further, the information on the exit path or the back road may be not only static information but also dynamic information that can be updated in real time in consideration of traffic jam information through communication or the like. Furthermore, a medium for storing such information is not limited to a disk such as a CD or a DVD, but a portable memory card can also be used.

The functional block diagram which shows the structure of embodiment which concerns on this invention. The flowchart of this embodiment. The image figure during a route search. Explanatory drawing which did not display the target road of a loophole or a back road in this embodiment. Explanatory drawing which displayed the target road of the escape road or the back road in this embodiment. Explanatory drawing which displayed the target road of the loophole or the back road in the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Absolute position and direction detection part 2 ... Relative direction detection part 3 ... Vehicle speed detection part 4 ... Main CPU and its peripheral circuit 5 ... ROM
6 ... DRAM
7 ... SRAM
8 ... VRAM
DESCRIPTION OF SYMBOLS 9 ... User interface part 10 ... Output part 11 ... Input part 12 ... Disk control part 13 ... FM multiplex reception and processing part 40 ... Own vehicle position specification part 41 ... Destination designation part 42 ... Route calculation part 43 ... Guidance control part 44 ... Route candidate extraction unit 45 ... Target road selection unit 46 for exit or back road ... Target road display unit A to H for exit or back road ... Target road M for exit or back road ... Memory group V ... Own vehicle mark

Claims (5)

Route candidate extraction means for extracting a plurality of guide route candidates from the departure point to the destination;
Guide route calculation for calculating a guide route from a departure point to a destination with a plurality of guide route candidates extracted by the route candidate extraction means as a calculation target, and selecting a guide route to be guided from among the plurality of guide route candidates Means,
In a navigation apparatus comprising guidance route guidance means for guiding the guidance route calculated by the guidance route calculation means,
A roadway / backway information storage means for pre-recording a road used as a roadway or backway as a roadway or backway ;
When the route candidate extraction unit extracts a plurality of guide route candidates, the plurality of guide route candidates extracted by the route candidate extraction unit and the information on the path or back road recorded in the path / back road information storage unit are matched, Of the exit paths or back roads recorded in the exit path / back road information storage means, select the exit road or back road that matches the plurality of guide route candidates extracted by the route candidate extraction means as the road to be displayed for the exit road or back road. Means for selecting a road to be displayed on a way or a back road;
A display target road storage unit loopholes or back roads displayed road selecting means of the loopholes or back road stores the displayed roads selected loophole or back roads,
The display target road of the loophole or back roads to be displayed road storage means stored loophole or back roads, and further comprising a display means for displaying together and the guide route in a different form from that of the guide route Navigation device. The display means is configured to display the exit road or back road display target road when the current position of the moving body approaches within a predetermined distance from the starting point of the exit road or back road display target road. The navigation device according to claim 1. When the moving object deviates from the existing guide route, the route candidate extraction unit extracts a new route candidate, and the guide route calculation unit recalculates the guide route,
The road to be displayed or the back road display target road selection means,
The new guide route candidate extracted by the route candidate extraction unit is matched with the information of the escape route or back road recorded in the escape route / back road information storage unit, and the escape route or back road recorded in the escape route / back road information storage unit in the middle, the matched loophole or back road as a new guidance route candidates said path candidate extracting means has extracted, to claim 1 or 2, characterized in that is adapted to select for display a road loopholes or back roads The navigation device described. By using a computer, a route candidate extraction step for extracting a plurality of guidance route candidates from the departure point to the destination, and a plurality of guidance route candidates extracted in the route candidate extraction step as a calculation target from the departure point to the destination A guide route calculation step for calculating a guide route up to and selecting a guide route to be guided from among the plurality of guide route candidates, and a guide route guide step for guiding the guide route calculated in the guide route calculation step In a navigation method including:
A step-out / backway information storage step for pre-recording a road used as a way-out or a backway as a way-out or a backway ;
When extracting a plurality of navigation route candidates in the path candidate extracting step, a plurality of navigation route candidates and the loophole-back road information storing hand From been loophole or backstreets information in step extracted by said route candidate extraction step Matching the path or back road that is recorded in the path / back road information storage step with the plurality of guide path candidates extracted in the path candidate extraction step, A step of selecting a road to be displayed for a passage or back road to be selected as a display target road;
A display target road storage step for storing the escape road or the back road, which is stored in the display road of the escape road or the back road selected in the display road selection step of the escape road or the back road, and
To include a display target road display step of displaying together and the guide route in a different form from that of the loophole or back road to be displayed road storage displayed roads stored loophole or back roads in step, the guide route A featured navigation method. By using a computer, a route candidate extraction function for extracting a plurality of guidance route candidates from the departure point to the destination, and a plurality of guidance route candidates extracted by the route candidate extraction function as calculation targets, from the departure point to the destination A guide route calculation function for calculating a guide route up to and selecting a guide route to be guided from among the plurality of guide route candidates, and a guide route guide function for guiding the guide route calculated by the guide route calculation function In a navigation program that enables a computer to
A loopback / backway information storage function for pre-recording roads used as loopholes or backstreets as loopholes or backpaths ;
Wherein when extracting a plurality of navigation route candidates in path candidate extraction function, butt the path candidate extraction function multiple navigation route candidates and the loophole-back road information storage function loophole or back road information was recorded similar extracted by The path or back road that matches the plurality of guide path candidates extracted by the path candidate extraction function among the roads or back roads recorded by the path / back road information storage function is displayed as a path or back road. The display target road selection function of the exit road or back road to be selected as the target road ,
A display target road data storage function of the loopholes or back roads stores display object road of the selected loophole or back roads in the display target road selection function of the loopholes or back roads,
Realize a display target road of the loophole or back roads to be displayed road storage function similar to the stored loophole or back roads, a display target road display function for displaying together and the guide route in a different form from that of the guide route, to the computer A navigation program characterized by letting

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