JP2002054938A - Present positon displaying device for vehicle, navigation device and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the malfunction in map matching processing in a case when the road shape obtained from a road map is largely different from the actual one to improve the accuracy in determining a position of a vehicle. SOLUTION: An ordinary map matching processing (S130) is executed in a case of not traveling on a mountain road, and a mountain road matching processing (S120) is executed in a case of traveling of a vehicle on the mountain road. As a road map of the mountain road is formed by deforming the actual road shape, it has high probability of not establishing the interrelation obtained in the ordinary map matching processing, as a result, the present position of the vehicle is displayed on a position out of the road, though the vehicle actually travels on the road. In the mountain road matching processing, the determination is not executed on the basis of the interrelation of the traveling locus and the road map which is used in the ordinary map matching process, but the present position is unconditionally changed to a predetermined position on a corresponding road on the road map to solve the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for detecting and displaying a current position of a vehicle by executing a map matching process.

[0002]

2. Description of the Related Art There is known a navigation device which displays a current position of a vehicle as it travels along with a road map on a display, sets an appropriate route from a current position to a destination, and provides route guidance. And contributes to a smoother drive.

In displaying such a current position of a vehicle and providing route guidance, it is fundamental to detect the current position of the vehicle. In the current position detection for the vehicle, for example, dead reckoning navigation calculation is performed using the azimuth change amount calculated based on the output value from the gyroscope and the moving distance calculated based on the output value from the vehicle speed sensor. What is performed is known as a basic technology (Japanese Patent Laid-Open No. 8-5424).
No. 8, etc.). However, since this method is “self-contained navigation” in which the vehicle itself detects the position of the vehicle, there is a disadvantage that the absolute position cannot be detected. Therefore, for example, GPS
There is also a technique for obtaining an absolute position (or an absolute direction) using radio waves for radio navigation transmitted from a satellite, a roadside beacon, or the like, and detecting a more appropriate current position. However,
In the case of information from a GPS satellite, it is necessary to assume that an error of about 100 m will occur. Therefore, there is a technique of performing correction by so-called map matching to improve the accuracy of position detection. This is to compare the travel trajectory to the current position of the vehicle calculated based on the dead reckoning navigation described above (only self-contained navigation or radio navigation to self-contained navigation) with road information based on map data. The position is estimated based on the characteristics.

[0004]

However, since the correction by the map matching process is based on the premise that the road shape obtained from the road map matches the actual road shape, the road obtained from the road map is not used. If the shape is significantly different from the actual road shape, a phenomenon occurs in which the map matching process malfunctions, and the accuracy of determining the current position of the vehicle is reduced. Here, the reason that the road shape obtained from the road map may be significantly different from the actual road shape is as follows. Originally, maps are created on the assumption that they are used by humans, so when creating maps, complex road shapes, such as mountain roads such as "Iroha Saka", are omitted from the road shape. In general, a deformed road shape is used. Therefore, an electronic map in which such a road map is stored in a CD-ROM, a DVD, or the like also includes deformed information such as a mountain road whose road shape is significantly different from the actual one.

[0005] These deformations of the road shape with respect to mountain roads do not cause a problem when viewed by a human, or in some cases, make it easier to identify the road. However, as described above, they are obtained from a road map. In the map matching process on the assumption that the road shape matches the actual road shape, there is no correlation between the actual trajectory of the vehicle and the road shape in the road map. Error. That is, a phenomenon in which the display indicating the current position of the vehicle deviates from the road occurs, and the accuracy of determining the vehicle position is reduced.

Here, a mountain road has been exemplified.
A similar problem occurs if the road is created by deforming the road shape. Therefore, the present invention prevents a map matching process from malfunctioning when a road shape obtained from a road map and an actual road shape greatly differ from each other, such as a mountain road, and improves the vehicle position determination accuracy. It aims to provide a current position display technology.

[0007]

According to the present position display device for a vehicle according to the present invention, a traveling locus up to a current position is compared with road information based on map data. If a predetermined correlation is established, the current position of the vehicle is detected by performing a map matching process of changing the current position to a predetermined position on the corresponding road in the road map, and the current position of the detected vehicle is determined. A road map around the position is displayed, and the current position of the vehicle is identifiably displayed on the road map. However, if the vehicle is traveling in a specific area, unconditionally execute a “specific area matching process” to change the current position to a predetermined position on the corresponding road in the road map, and The current position is detected.

[0008] Since the road map in this specific area is created by deforming the actual road shape, it is highly possible that the above-mentioned predetermined correlation does not hold. As a result, the road map actually travels on the road. However, the current position of the vehicle is displayed at a position off the road. Therefore, this problem is dealt with unconditionally, that is, even if the predetermined correlation is not established, by executing the specific area matching process and forcibly bringing the current position on the road in the road map. . As a result, even when the road shape obtained from the road map and the actual road shape are significantly different from each other, it is possible to prevent a malfunction of the map matching process and eliminate the inconvenience that the display indicating the current position of the vehicle deviates from the road. . As described above, it is possible to display the current vehicle position with improved vehicle position determination accuracy.

It is conceivable that the specific area is, for example, an area where a mountain road exists as described in claim 2. Then, when a mountain road is assumed as the specific area, it can be determined that the specific area is as follows. For example, as shown in claim 3,
Create and store in advance the area where mountain roads exist,
When the vehicle is traveling in the area, it may be determined that the vehicle is traveling in a specific area.

[0010] Alternatively, the determination may be made based on the actual driving situation. For example, in the case described in claim 4, when the road on which the vehicle is traveling is a single road within a predetermined range based on the vehicle position, it is determined that the vehicle is traveling in a specific area.
This is because mountain roads are often straight roads without branching, but roads in other areas rarely have no branching. Therefore, if the predetermined range is set appropriately, the area where the mountain road exists can be determined with a relatively high probability. Further, even if the road is not a mountain road, there is no other road in the vicinity, so that it is considered that there is little problem even if the specific area matching processing is unconditionally performed. In other words, if the road map for that single road is created by deforming the actual road shape, this specific area matching process will be an appropriate measure,
If the actual road shape is not deformed and created, the current position originally comes on the road.

In the case of claim 5, the amount of change in the vehicle azimuth per a predetermined moving distance of the vehicle is equal to or more than a predetermined value, and the altitude change value and / or the altitude value per a predetermined moving distance is constant. If it is not less than the value, it is determined that the vehicle is traveling in a specific area. For example, the azimuth change amount when moving 250 m is 270 degrees or more, and the altitude change amount is 10 m or more while moving 100 m, and the altitude value is 500 m
If the above condition is satisfied, it is considered that the possibility of a mountain road is very high. Further, as set forth in claim 6, the condition of claim 4 may be added to this condition, that is, the condition that the road on which the vehicle is traveling is a single road within a predetermined range based on the vehicle position. good.

Although the value per predetermined moving distance is adopted as the vehicle heading change amount and the altitude change value, the "moving distance" may be a linear distance or an actual running distance. It may be a distance. Further, if the sole condition is that the amount of change in the vehicle azimuth per predetermined traveling distance is equal to or more than a certain value, this is a mode that can be seen on a general road.
For example, there is a case where a person searches for a parking lot and turns around the city center. Also, if the sole condition is that the altitude change value or the altitude value is a certain value or more, this is also a form that can be seen on a general road. For example, if there are many hills in a highland city such as Matsumoto City or Nagano City, this condition may be satisfied. Therefore, these conditions are not determined alone, but only when a plurality of conditions are satisfied at the same time, and it is determined that the area is a specific area where a mountain road exists.

By the way, it is conceivable that the above-mentioned current position display device for a vehicle is realized as a part of a navigation device. On the displayed road map, a preset route to the destination and the current position of the vehicle are identifiably displayed, and predetermined route guidance is performed in consideration of the relationship between the route to the destination and the current position of the vehicle. If the vehicle current position can be displayed with improved vehicle position determination accuracy, the effectiveness of navigation is also improved.

The function of realizing the current position detecting means of the current position display device for a vehicle in a computer system can be provided, for example, as a program started on the computer system side. In the case of such a program, for example, it is recorded on a computer-readable recording medium such as a floppy (registered trademark) disk, a magneto-optical disk, a CD-ROM, and a hard disk, and is loaded into a computer system as needed and activated. Can be used. Alternatively, the program may be recorded in a ROM or a backup RAM as a computer-readable recording medium, and the ROM or the backup RAM may be incorporated in a computer system and used.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. It is needless to say that the embodiments of the present invention are not limited to the following examples, and can take various forms as long as they belong to the technical scope of the present invention.

FIG. 1 is a block diagram showing the overall configuration of a navigation device 1 according to the present embodiment. The navigation device 1 outputs a detection signal according to the angular velocity of the rotational motion applied to the vehicle, a gyroscope 60 corresponding to an “azimuth sensor”, and a vehicle speed sensor that outputs a pulse signal at intervals according to the traveling speed of the vehicle. 62 and GPS (Global Positioni
ng System) transmitted from an artificial satellite via a GPS antenna, and the position, direction (traveling direction),
A GPS receiver 64 for detecting speed and the like, a map data input device 56, an operation switch group 58, a navigation control circuit 50 connected thereto, a display device 51 connected to the navigation control circuit 50, and a speaker 52 And the external information input / output device 5
3 and a remote control sensor 54.

The navigation control circuit 50 is configured as a normal computer, and has a well-known CPU and RO inside.
M, RAM, I / O and bus lines for connecting these components are provided. And gyroscope 6
0, based on outputs from the vehicle speed sensor 62 and the GPS receiver 64, calculate data for performing dead reckoning such as the current position and the traveling direction of the vehicle. Therefore, the navigation control circuit 50
Corresponds to “current position detecting means”.

The map data input device 56 is a device for inputting various data including so-called map matching data, map data and landmark data for improving the accuracy of position detection. As a storage medium, C
Although a D-ROM or DVD is generally used, another medium such as a memory card may be used.

The display device 51 is a color display device. The display screen includes a vehicle current position mark input from the position detector 55, map data input from the map data input device 56, and A guidance route or the like to be displayed on a map can be displayed in an overlapping manner. As the display device 51, for example, a CRT, a liquid crystal display, a plasma display, or the like may be used.

The loudspeaker 52 is configured to notify the driver of the traveling guidance by voice. In this embodiment, the driver 52 displays both the display on the display device 51 and the voice output from the loudspeaker 52. Can be guided. The external information input / output device 53 is an external
For example, VICS (Vehicle Information and Communicat
ion system) is a device for receiving information provided from infrastructure such as a system and transmitting information to the outside. Information received from outside via the external information input / output device 53 is processed by the navigation control circuit 50. Also,
If necessary, the information processed by the navigation control circuit 50 is transmitted to the outside via the external information input / output device 53.

The navigation apparatus 1 receives a destination position from a remote control sensor 54 via a remote control terminal (not shown) (not shown) or an operation switch group 58. It also has a so-called route guidance function that automatically selects an optimal route to the destination and forms and displays a guidance route. As a technique for automatically setting the optimum route, a technique such as the Dijkstra method is known. It should be noted that, instead of such a route guidance to the destination, a process of simply displaying the current position of the vehicle on a map is always performed. In other words, in an unfamiliar area, a kind of navigating function will be exhibited even if only the current position of the vehicle is known. The operation switch group 58 includes, for example, a touch switch or a mechanical switch integrated with the display device 51, and is used for various inputs.

When a power switch (not shown) is turned on, the navigation ECU 50 starts executing various processes according to a program preset in a ROM (not shown). The processing relating to the detection of the current position of the vehicle will be described. In the present embodiment, for example, the GPS
The current position is detected based on positioning information by radio navigation received by the receiver 64, and this position is displayed on the display device 51.
Is superimposed on the map displayed in. When the vehicle starts running, the travel distance of the vehicle is calculated based on a pulse signal (vehicle speed pulse) corresponding to the vehicle speed input from the vehicle speed sensor 62, and the azimuth change amount is calculated based on the detection signal from the gyroscope 60. Is calculated. Then, the current position of the vehicle is calculated based on the calculated azimuth change amount and the moving distance or, if necessary, based on the GPS positioning information, and the vehicle current position is corrected by a map matching process described later. The corrected current position of the vehicle is identifiably displayed on the map displayed on the display device 51. The relative trajectory and the vehicle speed are also calculated based on the azimuth change amount and the moving distance.

The correction by the map matching is performed by checking the correlation between the traveling locus of the vehicle which is calculated based on the dead reckoning navigation and reaching the current position and the road information based on the map data.
However, in general, a road map stored in a CD-ROM, a DVD, or the like is created in a deformed road shape by omitting a part of the road shape for a mountain road as shown in FIG. Such deformation does not cause a problem when the driver visually recognizes the road. In some cases, the road can be easily identified.
Since it is assumed that the road shape obtained from the road map matches the actual road shape, no correlation can be obtained if the actual road shape deviates greatly. For this reason, a phenomenon that the display indicating the current position of the vehicle deviates from the road occurs, and the accuracy of determining the vehicle position is reduced.

In this embodiment, the following measures are taken. First, it is determined whether the vehicle is traveling on a mountain road. This determination processing has the contents as shown in the flowchart of FIG.
It is executed every 0 ms. In S10, S20, S30, it is determined whether the first condition, the second condition, and the third condition are satisfied, respectively. If all of the first to third conditions are satisfied, it is determined that the vehicle is traveling on a mountain road. Then, the mountain road flag is turned on (S40). On the other hand, if any one of the first to third conditions is not satisfied, it is determined that the vehicle is not traveling on a mountain road, and the mountain road flag is turned off (S50).
Here, the first to third conditions will be described.

The first condition is that the road on which the vehicle is traveling is a single road within a predetermined range based on the vehicle position. As the predetermined range, for example, a range within a radius of 450 m around the position of the own vehicle can be considered. Alternatively, as shown in FIG.
The range may be within 50 m. Note that this 450
m may be considered as a moving distance along a road, or as a linear distance, that is, a difference between position coordinates. FIG.
In (a), the difference is considered as a difference in position coordinates. If there is no branch point between the current position of the own vehicle and a position where the linear distance becomes 450 m in the vehicle traveling direction, it is determined that the road is a single road. This is because mountain roads are often straight roads without branching, but roads in other areas rarely have no branching. For example, in the case of the example shown in FIG. 5B, links A, B, and C exist between the position where the own vehicle is currently located and the position where the linear distance is 450 m in the traveling direction of the own vehicle. A1, A2 at the connection point between link A and link B
Are two branches. At the connection point between the link B and the link C, one link B1 branches. As described above, in an urban area, it is difficult to assume that there is no branch point before 450 m (in a straight line distance). Therefore, the first condition is that the road is straight.

The second condition is that an azimuth change amount (moving azimuth) per predetermined moving distance (for example, 250 m) is 270.
It is a condition that it is more than degree. Here, FIG.
As shown in the figure, a moving distance in a straight line distance is considered. Then, in this case, it is 180 in the moving distance of 250 m.
Since there are three degrees of curves, as shown in FIG. 6B, the movement azimuth when the movement distance is 250 m is about 540 degrees, which satisfies the second condition.

The third condition is that an altitude change per predetermined moving distance (for example, 100 m) is 10 m or more,
The condition is that the altitude value is 500 m or more. Here, a moving distance in a straight line distance is considered. The altitude information is obtained from the GPS receiver 64. As shown in FIG. 7A, altitude information is acquired every time the vehicle travels 100 m, and a determination is made based on the amount of change and the altitude value.

In this way, the determination as to whether or not the road is a mountain road is executed every 200 ms, and the mountain road flag is turned on.
/ OFF is set. At the same time, 100 vehicles
Each time the vehicle travels m times, the navigation control circuit 50 executes the matching processing of FIG. First, it is determined whether or not the mountain road flag is ON (S110).
If (S110: YES), the mountain road matching process (S120) is executed, and if the mountain road flag is OFF (S110: NO), the normal map matching process (S130) is executed.

The outline of the ordinary map matching processing in S130 is as follows. For example, the map data input device 5
6 from the road map data read from a storage medium such as a CD-ROM, the travel shape of the vehicle calculated based on the moving distance and the azimuth change amount obtained by the vehicle speed sensor 62 and the gyroscope 60. ) Are searched for a road whose degree of coincidence (degree of approximation) is within a predetermined range. Then, if there is a road whose degree of coincidence is within the predetermined range, the road having the highest degree of coincidence with the travel locus among the roads is located at the latest current position calculated by executing the position calculation processing. The closest position is determined as the current position of the vehicle, and if there is no road whose degree of coincidence is within a predetermined range with respect to the traveling locus of the vehicle, the latest current position calculated by executing the position calculation process Is directly determined as the current position of the vehicle.

On the other hand, the mountain road matching processing in S120 will be described with reference to the flowchart of FIG. In the first step S121 in FIG. 4, the moving distance Δx in the x direction and the moving distance Δy in the y direction are calculated by the following equations (1) and (2).
Ask like. Δx = Dist × cos θ (Expression 1) Δy = Dist × sin θ (Expression 2) Here, Dist is a value obtained by multiplying the number of vehicle speed pulses obtained from the detection signal from the vehicle speed sensor 62 by a distance coefficient, that is, the moving distance. And θ is the azimuth between nodes obtained from the road map data.

In step S122, the current position X in the x direction and the current position Y in the y direction are obtained as shown in the following equations (3) and (4). X = x0 + ΣΔx [Equation 3] Y = y0 + ΣΔy [Equation 4] Here, x0 and y0 are the current position in the x direction and the current position in the y direction, respectively, just before the mountain road. Further, 数 Δx and ΣΔy are obtained by multiplying the number of vehicle speed pulses obtained from the detection signal from the vehicle speed sensor 62 by the distance coefficient, respectively. is there.

In S123, the current position (X,
The position closest to Y) is determined as the current position of the vehicle. At this time, forcible matching is performed without determining whether or not the degree of coincidence (degree of approximation) of the road shape (road pattern) with respect to the traveling locus is within a predetermined range as in normal map matching.

As described above, according to the navigation apparatus 1 of the present embodiment, when the vehicle is not traveling on a mountain road, a normal map matching process (S130 in FIG. 3) is performed.
If the vehicle is traveling on a mountain road, a mountain road matching process (S120) is performed. In this mountain road matching process, the current position is unconditionally changed to a predetermined position on the corresponding road in the road map without performing a determination based on a correlation between the traveling locus and the road map performed in the normal map matching process. I do.

Since a road map of a mountain road is created by deforming the actual road shape, there is a high possibility that the correlation will not be established in the ordinary map matching processing. Although the vehicle is traveling, the current position of the vehicle is displayed at a position off the road. Therefore, this problem can be solved by using the mountain road matching processing to unconditionally bring the current position on the road in the road map unconditionally, that is, even if the predetermined correlation is not established. As a result, even when the road shape obtained from the road map and the actual road shape are significantly different, it is possible to prevent the map matching process from malfunctioning, and to eliminate the inconvenience that the display indicating the current position of the vehicle deviates from the road. Thus, the accuracy of determining the vehicle position is improved. As a matter of course, if it is possible to display the current vehicle position with the vehicle position determination accuracy improved, the effectiveness of navigation will also be improved.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the gist of the present invention. (1) In the above embodiment, as shown in FIG.
When all of the conditions were satisfied, it was determined that the road was a mountain road. However, if only the first condition that the road is a single road within a predetermined range based on the own vehicle position is satisfied, it can be determined that the road is a mountain road. As described above, such a state of a single road is likely to be a mountain road. Even if the road is not a mountain road, there is no other road in the vicinity, so that it is considered that there is little problem even if the current position is unconditionally matched on the road. That is,
If the road map for the one-way road is created by deforming the actual road shape, this specific area matching process is an appropriate measure, and it is not created by deforming the actual road shape In this case, the current position originally comes on the road.

When both the second condition and the third condition are satisfied, it can be determined that the road is a mountain road. However,
It is considered that satisfying the second condition and the third condition alone is not enough to determine that the road is a mountain road.
For example, in a case where the vehicle is turned around in the city center in search of a parking lot, the amount of change in the vehicle azimuth per predetermined moving distance is equal to or more than a certain value. Further, for example, when there are many hills in a highland city such as Matsumoto City or Nagano City, the altitude change value or the altitude value becomes a certain value or more. Therefore, it is determined that the road is a mountain road only when the second and third conditions are not satisfied alone but only when both conditions are satisfied at the same time.

In the third condition, "the altitude change per predetermined moving distance (for example, 100 m) is 10 m or more,
And the altitude value is 500 m or more ",
A single condition that “the amount of change in altitude per predetermined moving distance (for example, 100 m) is 10 m or more” or a single condition that “the altitude value is 500 m or more” may be used.

(2) In place of the first to third conditions in the above embodiment, a preset mountain road map is stored, and when a vehicle exists in the corresponding area, It may be determined that the vehicle is traveling on a mountain road. As this mountain road map, for example, as shown in FIG. 7B, a mountain road is defined by latitude information and longitude information, and a range in which the mountain road exists is shown in FIG. 7C. It is defined as a rectangular area, and if the vehicle is present in that area, it is determined that the vehicle is traveling on a mountain road.

(3) In the above embodiment, the navigation device 1 is used.
However, the present invention can be applied to an apparatus that executes processing other than navigation using the detected current position. (4) In the above embodiment, when detecting the current position,
GPS in addition to gyroscope 60 and vehicle speed sensor 62
Although the current position and the traveling direction of the vehicle are calculated based on the output from the receiver 64, the current position and the traveling direction of the vehicle are calculated based on the output from the gyroscope 60 and the vehicle speed sensor 62 at least. I just need.

The gyroscope 60 is an example of an azimuth sensor. For example, a gyroscope 60 that obtains a direction by accumulating a steering angle of a vehicle obtained from geomagnetism or a rotation difference between left and right steered wheels and the like may be used. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a navigation device as one embodiment of the present invention.

FIG. 2 is a flowchart showing processing related to mountain road determination.

FIG. 3 is a flowchart illustrating a process related to matching.

FIG. 4 is a mountain road matching processing routine executed during the processing of FIG. 3;

FIG. 5 is an explanatory diagram of a first condition for mountain road determination.

FIG. 6 is an explanatory diagram of a second condition for mountain road determination.

FIG. 7A is an explanatory diagram of a third condition for mountain road determination, and FIGS. 7B and 7C are explanatory diagrams of another embodiment for mountain road determination.

FIG. 8 is an explanatory diagram showing that correlation is not obtained by map matching because mountain roads and the like are stored as deformed road maps.

[Explanation of symbols]

 Reference Signs List 1 navigation device 50 navigation control circuit 51 display device 52 speaker 53 external information input / output device 54 remote control sensor 56 map data input device 58 operation switch group 60 gyroscope 62 vehicle speed sensor 64 GPS reception Machine

Continued on front page F-term (reference) 2C032 HB22 HC08 HC30 HD03 HD30 2F029 AA02 AB01 AB07 AB09 AC02 AC04 AC14 AC18 AD01 5B057 AA16 DA07 DC03 DC07 DC08 5H180 AA01 BB02 BB04 BB13 FF04 FF05 FF12 FF13 FF22 FF33

Claims (8)

[Claims] 1. A map storage means for converting and storing a road map into data, generating a running locus up to a current position of the vehicle, comparing the generated running locus with road information based on the map data, If the predetermined correlation is established, the current position of the vehicle is detected by performing a map matching process of changing the current position to a predetermined position on a corresponding road in the road map stored in the map storage means. A current position detecting means, a road map around the current position of the vehicle detected by the current position detecting means is read out from the map storage means and displayed, and the current position of the vehicle is displayed on the road map so as to be identifiable. A vehicle current position display device comprising: a road map in a specific area stored in the map storage unit, the road map being formed by deforming an actual road shape. It has a specific area determination means for determining whether the vehicle is traveling in the specific area, the current position detection means, the current area detection means, the vehicle in the specific area by the specific area determination means If it is determined that the vehicle is running, unconditionally executing a specific area matching process of changing the current position to a predetermined position on a corresponding road in the road map stored in the map storage means. Characteristic vehicle current position display device. 2. The current position display device for a vehicle according to claim 1, wherein the specific area is an area where a mountain road exists. 3. The current position display device for a vehicle according to claim 2, wherein the specific area determining means has previously created and stored an area where the mountain road exists, and runs the vehicle in the area. A vehicle current position display device that determines that the vehicle is traveling in the specific area. 4. The current position display device for a vehicle according to claim 2, wherein said specific area determining means is provided when the road on which the vehicle is traveling is a single road within a predetermined range based on the vehicle position. A current position display device for a vehicle, which determines that the vehicle is traveling in the specific area. 5. The current position display device for a vehicle according to claim 2, wherein the specific area determination means is configured to: change a vehicle azimuth per a predetermined movement distance of the vehicle by a predetermined value or more; A current position display device for a vehicle, characterized in that it is determined that the vehicle is traveling in the specific area when the vehicle altitude change value and / or the altitude value is equal to or more than a predetermined value. 6. The current position display device for a vehicle according to claim 5, wherein said specific area determining means further includes, in addition to said condition, a road on which said vehicle is traveling within a predetermined range based on a vehicle position. A current position display device for a vehicle, wherein it is determined that the vehicle is traveling in the specific area when the vehicle is a single road. 7. A vehicle current position display device according to claim 1, wherein a route to a preset destination and said current position detection are set on a road map displayed on said map display means. A navigation device that displays a current position of the vehicle detected by the means so as to be identifiable and performs predetermined route guidance in consideration of a relationship between the route to the destination and the current position of the vehicle. 8. A computer-readable recording medium in which a program for causing a computer system to function as said current position detecting means in the vehicle current position display device according to claim 1 is recorded.