JP2005091248A - Navigation system and alternative route presenting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system and an alternative route presenting method for enabling users to easily evaluate an alternative route. <P>SOLUTION: A map of a range including a different section between an alternative route for a retrieved guidance route and the guidance route is enlarged and displayed with a guidance route figure 461 indicating the guidance route, and a part of the guidance route different from the alternative route is flickered and displayed for a prescribed period. The display is switched to a display indicating an alternative route figure 511 indicating the alternative route instead of the guidance route figure 461 to display differences in distances to be traveled and drive times between the guidance route and the alternative route (a). Then a route to be displayed is switched between the alternative route (a) and the guidance route (b) according to user's operation. In the case that altering operation is performed by the user, the alternative route is set as a new guidance route. In the case that preservation operation is performed, the present guidance route is preserved, and the display is returned to a navigation screen for route guidance in which the guidance route and a present location are indicated on a map of the vicinity of the present location (d and e). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a navigation device that performs route guidance for a user.

  In a navigation device mounted on an automobile, as a technique for performing route guidance for a user, a guidance route is conventionally set between a destination received from a user and set as a current position on a map. A technique that guides traveling to a destination along a guide route by displaying an image representing the above is widely used.

  In addition, as a technology related to the navigation device that performs such route guidance, during route guidance according to the guidance route, it is searched whether there is an alternative route to a destination more suitable than the current guidance route. If there is an alternative route that is more suitable than the guide route, the alternative route is presented to the user, the selection of whether to set the alternative route as a new guide route is accepted, and the selection to set is accepted. In such a case, a technique is known in which an alternative route is set as a new guidance route and subsequent route guidance is performed (for example, Patent Document 1).

In addition, as a technique for presenting such a guide route and an alternative route to be used as a substitute for the guide route to the user, there is known a technology for displaying an image representing both the guide route and the alternative route on a map. (For example, patent document 2).
JP 2003-90732 A JP 2001-304890 A

Now, it is preferable to present the above alternative route to the user in a form in which the user can evaluate in detail whether or not the alternative route should be adopted as a new guidance route.
However, according to the technique for presenting an alternative route by displaying an image that represents both the guide route and the alternative route on the map, since the plurality of routes are displayed on the same map, the display tends to be complicated, and the user However, it may be difficult to grasp information for evaluating an alternative route.

  Therefore, an object of the present invention is to present an alternative route that is an alternative to the guidance route so that the user can more easily evaluate the alternative route.

  In order to achieve the above object, the present invention provides a navigation device that guides traveling along a guidance route set between a destination and a route that is an alternative to the guidance route from the current position to the destination. An alternative route search means for searching as follows, a guide route guidance screen showing the guide route on a map when the alternative route is searched, and an alternative route guide screen showing the alternative route on a map, Alternative route presenting means for alternately displaying and guide route updating means for setting the alternative route as a new guide route in accordance with an explicit or implicit instruction from the user are provided.

  According to such a navigation device, instead of displaying the guide route and the alternative route on the map at the same time, the guide route guide screen showing the guide route on the map and the alternative showing the alternative route on the map By alternately displaying the route guidance screen, the alternative route is presented to the user, so that it is possible to compare and evaluate the user's alternative route and the guidance route, and eliminate the complexity of the display screen. Can do. Therefore, the user can easily evaluate the alternative route.

  Here, the alternate display of the guidance route guidance screen and the alternative route guidance screen in such a navigation device may be performed automatically, but the alternative route presenting means responds to a predetermined user operation. Then, the guidance route guidance screen and the alternative route guidance screen may be switched alternately.

  In addition, when the alternative route presenting means searches for the alternative route, such a navigation device can identify the guidance route on a map and a section different from the alternative route of the guidance route. After displaying the change candidate section display screen expressed by the above, the guidance route guidance screen and the alternative route guidance screen may be displayed alternately.

  Further, such a navigation device includes a range around the two sections, including a section different from the alternative route of the guide route and a section different from the guide route of the alternative route in the alternative route presenting means. It is preferable that the calculated range is set as the range of the map displayed on the guidance route guidance screen and the alternative route screen.

  By doing this, it is possible to extract and present to the user only the differences between the guide route and the alternative route, not the entire guide route or the entire alternative route. Can be made easier.

  As described above, according to the present invention, it is possible to present an alternative route as an alternative to the guide route so that the user can more easily evaluate the alternative route.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a configuration of a navigation device according to the present embodiment.
As shown in the figure, the navigation device includes a control device 1, a recording medium drive 2 for accessing a recording medium 21 such as a DVD-ROM or hard disk storing map data, a GPS receiver 3, an angular acceleration sensor, or a vehicle speed sensor. A running state sensor 4 for detecting the running state of the vehicle, a VICS receiving device 5 for receiving traffic information by a vehicle information and communication system (VICS), a remote control 6 (remote controller) for receiving input from the user, and a display device 7 I have. Here, VICS is a system that transmits and receives real-time road traffic information about every 5 minutes through radio wave beacons, optical beacons, FM multiplex broadcasting, and the like. The VICS receiver 5 is a device that receives the traffic information transmitted as described above, and includes a radio beacon receiver, an optical beacon receiver, an FM multiplex broadcast receiver, and the like.

  The control device 1 includes a map data buffer 101, a map data read processing unit 102, a current state calculation unit 103, a route search unit 104, a navigation image generation unit 105, a traffic information acquisition unit 106, a memory 107, a main control unit 108, A GUI control unit 109 is provided. Here, a dotted line 121 inside the control device 1 in FIG. 1 indicates an access path of each part to map data stored in the map data buffer 101, and a thick line 122 indicates a path of control information between each part and each part of various data. The thin line connected to the GUI control unit 109 indicates the route of operation information and image information input / output with the user using the remote controller 6 or the display device 7.

  However, the control device 1 described above may be a CPU circuit having a general configuration including peripheral devices such as a microprocessor, a memory, and other graphic processors and geometric processors in terms of hardware. In this case, each unit of the control device 1 described above may be realized as a process embodied by a microprocessor executing a program prepared in advance. In this case, such a program may be provided to the control device 1 via the recording medium 21 or an appropriate communication path.

Next, the structure of the map data stored in the recording medium 21 is shown.
Here, the map data is managed in units called leaflets for each predetermined geographical area, and each leaf is composed of a plurality of levels according to the degree of detail of the map. Each level map of each leaf consists of one or more units, and each unit corresponds to the geographical area of the leaf to which it belongs or a divided area, and maps the corresponding area. , Expressed at the level to which it belongs.

As shown in FIG. 2, the map data includes management data describing the relationship between each unit and the leaf, corresponding area, and level, basic map data representing the map, route data, and a VICS conversion table. Composed.
Here, the basic map data includes the unit data for each unit described above, and unit management data describing the relationship between each unit data and the leaf, corresponding area, and level. Each unit data includes a road unit representing a road network in the unit and a drawing unit for defining a display map in the unit.

The road unit has a node list, a link table, and connection data describing connection and correspondence of nodes and links with other units.
Here, in the road unit, the road is expressed as a set of links that are straight lines, and the end point of each link is a node. Such a node is always provided at a connection point of a road such as an intersection, and is always provided at a boundary between adjacent units. In addition, each link has a direction, and if the road is one-way between two adjacent nodes via the link, only one link in the direction of traffic is provided. In principle, two links in opposite directions are provided.

  The node list includes a node record for each node. Each node record includes a node number, a node coordinate, a node attribute indicating whether the node is a node corresponding to an intersection or an expressway entrance, and the like. A connection link number list, which is a list of link numbers of links connected to the node, and an adjacent node number list, which is a list of node numbers of nodes adjacent to the node via the link, are described.

  Next, the link table includes a link record for each link, and each link record includes a link number, a starting node number indicating the node number of the node that is the starting point of the link, and a node number of the node that is the ending point of the link. End node number to be shown, road attributes representing various information about the section of the road corresponding to the link, link distance, link direction, link cost that is the cost for route search given to the link, route number of the route to which the link belongs Etc. are described. Here, as the road attribute, a road type indicating a type such as a toll road of a road to which the link belongs, a national road, a prefectural road, a road width of the road section corresponding to the link, the number of lanes, and the like are described.

Next, the drawing unit is used to display geographical information such as geographical features, road shapes, and facility shapes, text information displayed on the map such as area names and facility names, and facilities such as gas stations on the map. The facility mark to be displayed to indicate the existence of the facility is specified.
The route data included in the map data has route records provided for each road, and each route record includes a route number that is an identifier of a road, an expressway of each road, a national road, a prefectural road, etc. The route type and the route name of each road are described.
The VICS conversion table is a table for coordinate conversion that describes the correspondence between the coordinate system used in VICS and the coordinate system used in basic map data.
Next, data stored in the memory 107 of the control device 1 in FIG. 1 will be described.
As shown in FIG. 3, the memory 107 stores current state information 301, destination data 302, guidance route data 303, alternative route data 304, and traffic information records 305.
The current state information 301 includes current position data 3011, current traveling direction data 3012, and traveling link data 3013. The current position data 3011 is data representing the current position coordinates of the vehicle. The traveling link data 3013 is data indicating the link number of the currently traveling link. The destination data 302 represents the coordinates of the destination on the link.

  The guide route data 303 is data representing the guide route, and includes a route link list 3031 describing the link number of the link through which the guide route passes and the cost of the link in order of passing, and the node number of the node through which the guide route passes. A route node list 3032 described in the order of passage.

  Further, the alternative route data 304 is data representing an alternative route that is a candidate route for the guide route, and, like the guide route data 303, the link number of the link through which the alternative route passes and the cost of the link in order of the route. The described alternative route link list 3041 and the alternative route node list 3042 in which the node numbers of the nodes through which the alternative route passes are described in the order of passage.

  The traffic information record 305 is provided corresponding to the traffic information received by the VICS receiver 5, and each traffic information record 305 shows the reception time when the traffic information is received and the traffic information. Location information that represents points and road sections, event types that describe the types of events such as traffic restrictions, traffic jams, and travel times required by traffic information, and detailed information that describes the details of events such as the degree of traffic jams and travel times Stored.

Now, referring back to FIG. 1, in such a configuration, the map data read processing unit 102 reads the required range of map data from the recording medium 21 via the recording medium drive 2 under the control of the main control unit 108, and the map data Store in the buffer 101.
Further, the current state calculation unit 103 repeatedly performs the following processing.
That is, the current state calculation unit 103 matches the current position estimated from the output of the traveling state sensor 4 or the GPS receiver 3 with the map around the current position previously determined read from the map data buffer 101. Processing, etc., the most probable link coordinates as the current position, the most probable link direction as the current travel direction, and the most probable link as the current travel link, the current position coordinates and the current travel direction, respectively. The link is determined as the running link, and is set in the current position data 3011, the current running direction data 3012, and the running link data 3013 in the memory 107.

  In addition, the traffic information acquisition unit 106 decodes the traffic information received by the VICS receiver 5 with reference to the VICS conversion table of the map data, and stores it in the memory 107 as a traffic information record 305. In addition, the traffic information acquisition unit 106 deletes the traffic information record 305 having the same type and the same position information as the traffic information received by the VICS receiving device 5, or the reception time is the road as viewed from the current time and the current position. A process of deleting the traffic information record 305 indicating that the traffic information is no longer valid is also performed.

Further, the main control unit 108 receives a destination setting from the user via the remote controller 6 and the GUI control unit 109 in response to a user destination setting request, and sets this in the destination data 302.
Then, the route search unit 104 is searched for a guidance route to the destination indicated by the destination data 302. The route search unit 104 reads road data of road units in the necessary geographical area from the map data buffer 101, and travels from the current position coordinates indicated by the current position data 3011 of the memory 107 to the destination coordinates indicated by the destination data 302. The minimum cost route that first follows the link indicated by the medium link data 3013 is calculated as a guide route based on a predetermined cost model using the link cost of the link record and the traffic information indicated by the traffic information record 305, and is calculated The route data of the guide route is stored in the route link list 3031 and the route node list 3032 of the guide route data 303, respectively. That is, for example, when a cost model with travel time as one of the costs is used as the cost model, the travel time required for the link is included in the link cost of the link record. Then, the travel time required for each link is corrected according to the traffic information in the traffic information record 305, and the cost related to the travel time of the route is obtained. Here, for the correction of the required travel time of the link according to the traffic information, for example, for the link where the traffic congestion has occurred, the link time is required for the travel time according to the degree of the traffic congestion indicated by the traffic information and the link length. This is done by correcting the travel time.

Further, the main control unit 108 sets the navigation image window 410 shown in FIG. 4A on the entire display screen of the display device 7, and then repeats the following navigation image generation processing.
That is, the main control unit 108 determines the direction corresponding to the traveling direction indicated by the current traveling direction data 3012 as the display direction, determines the scale according to the user setting or initial setting made in advance, and determines from the current position data 3011 A predetermined range determined in accordance with the determined display orientation and the determined scale around the read current position is determined as the display range. Here, the display direction is calculated so that the current traveling direction is always on.

  Then, the navigation image generation unit 105 draws the map display element, the character string, and the facility mark represented by the drawing unit based on the drawing unit in the determined display range, and the direction corresponding to the direction indicated by the current traveling direction data 3012. The drawing of the current position mark facing to the position corresponding to the current position indicated by the current position data 3011 is performed with the azimuth indicated by the determined display azimuth as the top. When the guide route data 303 is set, the main control unit 108 instructs the navigation image generation unit 105 to guide the route closer to the destination side from the current position indicated by the guide route data 303 in the determined display range. Is drawn with the azimuth indicated by the determined display azimuth as the top. Further, when the route is being guided and the destination is included in the display range, the main control unit 108 causes the navigation image generation unit 105 to draw a destination mark indicating the position of the destination.

The navigation image generation unit 105 generates the navigation image by performing the above-described drawing under the control of the main control unit 108, and the navigation image window 410 set on the display screen of the display device 7 via the GUI control unit 109. To display.
FIG. 4a shows an example of the navigation image displayed in this manner. As shown in the figure, the navigation image displayed on the navigation image window 410 set on the entire surface of the display device 7 is a map display element. In addition, the current position mark 402 and the guide route graphic 403 are represented on the map image 401 representing various character strings and facility marks. However, when the guide route data 303 is not set and the route is not being guided, the guide route graphic 403 is not drawn as described above. In addition, when the destination is included in the display range, the destination mark is also displayed.

  During the route guidance as described above, the main control unit 108 determines that the distance between the current position coordinates indicated by the current position data 3011 and the destination coordinates indicated by the destination data 302 is a predetermined distance (for example, several tens of meters) or less. If the distance is less than the predetermined distance, it is assumed that the vehicle has arrived at the destination, the guidance route data 303 and the destination data 302 are cleared, and the route guidance is terminated.

Then, the main control unit 108 performs the following alternative route search process during route guidance according to the above guidance route.
FIG. 6 shows the procedure of the alternative route search process.
However, in the following description, the application to the case where only the travel time is used as the cost will be described as an example of the cost model for the route search.
As shown in the figure, in this process, first, the guide route data 303 and the current state information 301 are referred to, and the cost of the guide route from the current position to the destination is determined as the link cost of the route link list 3031 and the traffic information record. Based on 305, the current cost is calculated (step 602). Here, the current cost changes dynamically according to the traffic situation indicated by the traffic information received by the VICS receiver 5 in addition to the change with the movement of the current position.

  Next, when there is a traffic information record 305 that causes an increase in the cost of the guidance route from the current position to the destination, the main control unit 108 causes the contents of the traffic information record 305 to be bypassed. Information is extracted (step 604). In other words, for example, when a model with travel time as one of the costs is used as a cost model, there is a traffic jam at a point on the guidance route, and this traffic jam does not cause a current traffic cost If the number is increased, the content of the traffic information record 305 representing the occurrence of the traffic jam is extracted as detour cause information.

  Next, the route search unit 104 searches for a route with the current minimum cost from the current position to the destination as an alternative route based on the map data and the traffic information record (step 606), and stores it in the alternative route data 304. The cost of the alternative route is obtained as an alternative cost with reference to the alternative route data 304 and the traffic information record 305 (step 608).

  Then, the alternative cost is compared with the current cost (step 610). If the current cost is equal to or lower than the alternative cost, the process directly returns to step 602. On the other hand, if the alternative cost is smaller than the current cost, the difference between the travel distance from the current position to the destination and the difference in travel time between the alternative route and the guidance route are obtained as comparison information (step 612).

  Then, referring to the guide route data 303 and the alternative route data 304, the guide route, the branch point of the alternative route, and the junction point are obtained (step 614). Further, the range on the map including the section between the branch point and the junction point of the guidance route and the section between the branch point and the junction point of the alternative route is calculated as the notification range. (Step 616).

  That is, when the alternative route is obtained as shown by the broken line 430 when the guidance route is set as shown by 420 in FIG. 4b, the point 431 and the point 432 are obtained as the branch point and the junction point. The aspect ratio of the guidance route between the branching point 431 and the junction point 432 and the alternative route interval with a margin equal to or greater than the predetermined minimum margin is the aspect ratio of the window frame area of the alternative route selection window described later. The minimum range 440 equal to is calculated as the notification range. Note that reference numeral 450 in the figure indicates the display range of the map image 401 that is included and displayed in the navigation image at this time.

Returning to FIG. 6, if the notification range is calculated in this way, the main control unit 108 executes an alternative route selection process (step 618). If the alternative route selection process is completed, the main control unit 108 proceeds to step 602. Return.
Here, the procedure of the alternative route selection process in step 618 is shown in FIG.
As shown in the figure, in the alternative route search process, first, the display of the navigation image window 410 is closed, and instead, the alternative route selection window 460 shown in FIG. 4c is displayed (step 702). Then, according to the size of the notification range and the alternative route selection window 460, the display scale of the map of the notification range is determined so that the map of the notification range is displayed to the full size within the window frame of the alternative route selection window 460 (step). 704).

  Then, when the map 469 within the notification range is displayed on the alternative route selection window 460 at the determined display scale. Further, as shown in FIG. 4c, a guidance route graphic 461 representing a guidance route within the notification range is drawn on a map displayed on the alternative route selection window 460 together with a dummy current position mark 465 representing the traveling direction toward the branch point. (Step 706).

Also, as shown in FIG. 4c, the branch point on the map 469 displayed in the alternative route selection window 460 with the point name (for example, intersection name) 462 of the branch point obtained earlier and the point name 463 of the junction point Are displayed in the form of balloons from the meeting point (step 708).
Then, the main control unit 108 next sets a corresponding interval between the branching point and the joining point of the guidance route graphic 403 displayed in the alternative route selection window 460 for n seconds (for example, 3 seconds) and a predetermined interval (for example, , 0.5 second interval) (step 710). That is, switching of a predetermined interval between the display of FIG. 4c and the display of FIG. 4d is continued for n seconds.

  If such blinking continues for n seconds, as shown in FIG. 5a, the alternative route selection window 460 includes a new route button 501, a current route button 502, a change button 503, an operation button for the maintenance button 504, The previously obtained comparison information is displayed (step 712). In the illustrated example, the comparison information 510 is displayed in the new route button 501. Further, the guide route graphic 461 representing the guide route within the notification range is deleted, and an alternative route graphic 511 representing the alternative route within the notification range is drawn instead (step 714). Here, the new route button 501 of the current route button 502 and the new route button 501 is highlighted to indicate to the user that the alternative route is displayed.

  Next, a timer whose timeout time is set to 10 seconds, for example, is started (step 716). Thereafter, the current route switching operation by the current route button 502 is generated (step 718) or the change operation by the change button 503 is generated. (Step 720), occurrence of a timer timeout (Step 722), or occurrence of a maintenance operation by the maintenance button 504 (Step 724) is monitored. If a time-out or change operation occurs, the guidance route data 303 is updated with the alternative route data 304 (step 734), the alternative route selection window 460 is deleted (step 736), and the navigation image window 410 is displayed. Returns and ends the process. If a maintenance operation has occurred, the alternative route selection window 460 is deleted as it is (step 736), the display of the navigation image window 410 is restored, and the process ends.

  On the other hand, when the current route switching operation occurs (step 718), the guide route graphic 511 representing the alternative route within the notification range is deleted, and instead the guide route graphic 461 representing the guide route within the notification range is drawn. (Step 726). Here, the current route button 502 among the new route button 501 and the current route button 502 is highlighted to indicate to the user that the current guidance route is displayed.

Then, the occurrence of a new route switching operation (step 728) by the new route button 501, the occurrence of a change operation by the change button 503 (step 730), or the occurrence of a maintenance operation by the maintenance button 504 (step 732) is monitored.
When a change operation occurs, the guidance route data 303 is updated with the alternative route data 304 (step 734), the alternative route selection window 460 is deleted (step 736), and the display of the navigation image window 410 is restored. To finish the process. If a maintenance operation has occurred, the alternative route selection window 460 is deleted as it is (step 736), the display of the navigation image window 410 is restored, and the process ends.

When a new route switching operation occurs (step 728), the process returns to step 714.
According to the alternative route selection process described above, when an alternative route is searched, a navigation selection window is set. First, as shown in FIG. 4C, a map in a range including the difference between the guide route and the alternative route shows the guide route. The displayed guide route graphic 461 is enlarged and displayed, and portions different from the substitute route of the guide route are blinked for a predetermined period as shown in FIGS.

Thereafter, the display of the navigation selection window is automatically switched to one representing an alternative route graphic 511 representing an alternative route instead of the guidance route graphic 461 as shown in FIG. 5a. In addition, comparison information representing the difference in travel distance and travel time between the guide route and the alternative route is displayed.
Here, the user alternately switches the route displayed in the navigation selection window between the alternative route and the guidance route as shown in FIGS. 5A and 5B by the current route switching operation and the new route switching operation. Can do.
Further, the user examines the alternative route and the relationship between the alternative route and the current guidance route by such display, and thereafter, when the alternative route is to be set as a new guidance route, the change operation is performed by the change button 503. By doing so, the searched alternative route can be set as a new guidance route. Further, even when the alternative route shown in FIG. 5a is displayed, the alternative route can be similarly set as the guidance route even if the timer is left for the time-out period of the timer. When the alternative route is set in this way, the display screen of the display device 7 displays a map of the display range 551 corresponding to the current position 550 at that time, the guide route figure 403, and the current position shown in FIG. The mark 402 returns to the navigation image window 410 shown in FIG. 5d showing the new guidance route and the current position. Then, when the navigation route proceeds as it is and reaches the current position 560 shown in FIG. 5c, the navigation image displays a map of the display range 561 corresponding to the current position 560 at that time, the guidance route graphic 403, and the current location. The position mark 402 shows the guidance route and the current position as shown in FIG. 5e, and traveling along the newly set guidance route is guided.

  On the other hand, when the user examines the relationship between the alternative route and the current guidance route and wants to use the current guidance route as it is without setting the alternative route as the guidance route, a maintenance operation is performed with the maintenance button 504. As it is, the navigation device can continue the guidance according to the original guidance route shown in FIG. 4a.

The embodiment of the present invention has been described above.
By the way, the above alternative route selection processing can also be performed as follows.
That is, first, as shown in FIG. 8a, a map within the notification range, a dummy current position mark 465 indicating the traveling direction toward the branch point, a guide route graphic 461 indicating the guide route within the notification range, and the point name of the branch point The point name of the merge point and the display 801 of “current route” are drawn in the alternative route selection window 460, and the corresponding section between the branch point and the merge point of the guidance route graphic 403 is blinked at predetermined intervals for n seconds. .

Then, if n seconds have elapsed, as shown in FIG. 8b, the guide route graphic 461 is deleted, and the alternative route graphic 511 and the comparison information 802 are displayed for n seconds.
Thereafter, the user can change the display of the guidance route graphic 403 of FIG. 8a by blinking the section between the branch point and the merge point and the display of the alternative route graphic 511 of FIG. 8b at intervals of n seconds from the user. Whether a change operation by 503 or a maintenance operation by the maintenance button 504 is performed, or after the alternative route selection process is started, the operation is alternately repeated until a predetermined period L elapses.
When a change operation occurs, the guidance route data 303 is updated with the alternative route data 304, the alternative route selection window 460 is deleted, the display of the navigation image window 410 is restored, and the process is terminated. If a maintenance operation occurs, the alternative route selection window 460 is deleted as it is, the display of the navigation image window 410 is restored, and the process is terminated. If the predetermined period L has elapsed without any change operation or maintenance operation, the guidance route data 303 is updated with the alternative route data 304, the alternative route selection window 460 is deleted, and the navigation image window 410 is displayed. Returns and ends the process.

It is a block diagram which shows the structure of the navigation apparatus which concerns on embodiment of this invention. It is a figure which shows the map data with which the navigation apparatus which concerns on embodiment of this invention is provided. It is a figure which shows the data which the navigation apparatus concerning embodiment of this invention stores in memory. It is a figure which shows the example of a display screen of the navigation apparatus which concerns on embodiment of this invention. It is a figure which shows the example of a display screen of the navigation apparatus which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the alternative route search process which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the alternative route selection process which concerns on embodiment of this invention. It is a figure which shows the other example of the display screen of the navigation apparatus which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Control apparatus, 2 ... Recording medium drive, 3 ... GPS receiver, 4 ... Running condition sensor, 5 ... VICS receiver, 6 ... Remote control, 7 ... Display apparatus, 21 ... Recording medium, 101 ... Map data buffer, 102 DESCRIPTION OF SYMBOLS ... Map data read-out processing part, 103 ... Current state calculation part, 104 ... Route search part, 105 ... Navigation image generation part, 106 ... Traffic information acquisition part, 107 ... Memory, 108 ... Main control part, 109 ... GUI control part.

Claims (5)

A navigation device that guides driving along a guidance route set up to a destination,
An alternative route search means for searching for an alternative route to the guide route from the current position to the destination as an alternative route;
An alternative route presenting means for alternately displaying a guidance route guidance screen showing the guidance route on a map and an alternative route guidance screen showing the alternative route on a map when the alternative route is searched; ,
A navigation apparatus comprising: a guide route update unit that sets the alternative route as a new guide route in accordance with an explicit or implicit instruction from a user. The navigation device according to claim 1,
The navigation apparatus according to claim 1, wherein the alternative route presenting unit alternately switches the display of the guidance route guidance screen and the alternative route guidance screen according to a predetermined user operation. The navigation device according to claim 1 or 2,
When the alternative route is searched, the alternative route presenting means displays a change candidate section display screen that displays the guidance route on a map in a form that can identify a section different from the alternative route of the guidance route. A navigation device characterized in that after the display, the guidance route guidance screen and the alternative route guidance screen are alternately displayed. The navigation device according to claim 3,
The alternative route presenting means calculates a range around the two sections, including a section different from the alternative route of the guide route and a section different from the guide route of the alternative route, and calculates the calculated range, A navigation device characterized in that it is set as a range of a map to be displayed on the guidance route guidance screen and the alternative route screen. In a navigation device for guiding traveling along a guide route set up to a destination, an alternative route presentation method for presenting a substitute route for the guide route as an alternative route,
Searching for an alternative route as an alternative route to the guide route from the current position to the destination;
Alternately displaying a guidance route guidance screen showing the guidance route on a map and an alternative route guidance screen showing the substitution route on a map when the alternative route is searched; and
An alternative route presentation method comprising: setting the alternative route as a new guidance route in accordance with an explicit or implicit instruction of a user.

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