JP2000009484A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the effectiveness of guidance and ease-of-use, by enabling only required guidance to be made for each user when guiding a branch point in a path. SOLUTION: Branch point guidance processing is made (S130) every time when a vehicle approaches a guidance branch point that exists on a destination path (S120: YES). When the vehicle drives away from the destination path, information regarding the deviation branch point and a destination path near the branch point is stored as caution-arousing information (S90). Then, when the vehicle approaches the target branch point of the caution-arousing information through the same path (S140: YES) at the time of guidance thereafter, a caution is aroused for the branch point (S150), thus arousing a caution to the user at the branch point where the user deviated from the path while the driving was processing on the same path and is effective to prevent the user from deviating from the path again by mistake and hence coping with user's individual requests.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device for guiding a route to a set destination, and more particularly to a navigation device characterized by branch point guidance.

[0002]

2. Description of the Related Art There is known a navigation apparatus which detects a current position by a GPS or the like as a vehicle travels and displays the current position together with a road map on a display to smoothly reach a destination. . further,
A navigation device that sets an appropriate route from a current position to a destination and uses it as a guide is also known, and contributes to a smoother driving.

[0003] As such a navigation device, there is known a navigation device which performs a traveling guidance for a branch point by voice every time the vehicle approaches a branch point to be guided to a user on a route. For example, the voice guidance of the distance to the junction and the direction of the turn, such as "XX meters ahead to the right." As described above, there is also known one that guides to the name of a branch point. In this way, the user is notified by voice with good timing, so that the user does not need to frequently pay attention to the positional relationship between the current location and the branch point, which is very convenient.

[0004] Guidance for the branch point is provided only when it is determined that guidance is necessary in the navigation device based on the road shape and surrounding conditions.

[0005]

However, whether or not this guidance is necessary depends on the user's feeling in many cases, and due to individual differences, the guidance is not always optimal for all users. In other words, if there is no guidance for a certain branch point, even if a certain user can run along the route without the guidance, the other user will not be guided and will be off the route. It is also possible that Specifically, the following situation can be considered. For example, it is assumed that a prefectural road having a small width is connected to a national road having a large width to form a branch point. When a destination route that runs on a “road” is set on a national road, guidance is generally not provided at the branch point. However, if the national highway is curved and the prefectural road mentioned above is connected to the part where the curve starts, and from the current driving direction, entering the prefectural road is almost straight ahead, A user who thinks that he or she is going straight ahead because there is no access may enter the prefectural road.

[0006] However, if guidance is provided for all branch points where there is even a small possibility of such a possibility, on the contrary, a user who can normally travel along a route without such guidance is extra. It will be a guide. In particular, when providing voice guidance, the user needs to pay attention to the voice guidance even if the user does not eventually need it.
Attentiveness to truly needed guidance tends to be distracted, which can lead to reduced effectiveness of guidance. From the viewpoint of the effectiveness of the guidance and the improvement of usability, it can be said that it is preferable to approach a state in which only necessary guidance is provided to each user.

Accordingly, the present invention solves such a problem, and at the time of guidance of a branch point in a route, approaches the state where only necessary guidance is provided to each user, thereby improving the effectiveness of guidance. Another object of the present invention is to provide a navigation device with improved usability.

[0008]

According to the first aspect of the present invention, there is provided a navigation apparatus in which a guide means is set as a route from a departure place to a destination. Every time the vehicle approaches a predetermined branch point on the destination route to be guided, travel guidance is performed for that branch point. In setting the destination route, for example, the route cost is calculated using the Dijkstra method based on the link information of the link connecting the nodes and the connection information between the links, and the route setting is performed by connecting the link having the minimum route cost. It is possible to do.

If it is determined that the moving body has deviated from the destination route while the traveling guidance is being provided by the guide means, the departure point and the destination near the departure point are determined. Information about the route is stored in the alert information storage means as alert information. If the moving object approaches the branch point targeted for the alert information on the same route as the destination route stored in correspondence with the branch point, the guidance unit issues a warning about the branch point. Arouse.

Therefore, it is possible to alert the user at a branch point where the user has accidentally deviated from the route while traveling on the same route, and to prevent the user from accidentally deviating from the route again. It is valid. In particular,
This is effective when the vehicle accidentally deviates from the route at a branch point that is not a target of travel guidance. It should be noted that "the case where the moving body approaches the destination route stored in correspondence with the branch point on the same branch point as the target of the alert information" is the same branch point. This is because, for example, the object may not be the target when approaching from the opposite direction or when the passing method of the branch point is different. That is,
Depending on what route is set, the possibility of traveling in the wrong direction at the branch point changes, so if you travel on any route other than just the branch point By remembering what happened,
More appropriate alerting can be realized.

[0011] Further, in this manner, the branch point to be guided by the guide means can be limited to only predetermined ones existing on the destination route. Specifically, when there is no guidance for a certain branch point, a certain user A can travel along the route without the guidance, and another user B has no guidance. If it is conceivable that the vehicle may deviate from the intersection, the branch point is not set as a target of travel guidance.

In this way, for the user A,
There is no need for extra guidance and no need to feel complicated. In other words, it is possible to approach a state where only the guidance necessary for the user A is performed, and the effectiveness and the usability of the guidance are improved.
On the other hand, for the user B, there is a possibility that the route guidance may deviate from the route if only the guidance target branch point is provided. In this case, the branch point is the alert target branch point corresponding to the user B. In the next and subsequent guidance processes, a warning is issued to the branch point. Therefore, it is possible for the user B to approach a state where only necessary guidance is provided, and the effectiveness and usability of guidance are improved.

That is, whether or not guidance is required depends on the user's feeling in many cases, and due to individual differences, it is not always necessary that all users have the same guidance at the same branch point. Therefore, in the present invention, it is possible to cope with such a user-specific request by setting the branch point to be alerted based on the past history of each user.

By the way, when the vehicle runs off the destination route, the vehicle may deviate from the route intentionally, for example, when the vehicle accidentally comes off as described above, or when the vehicle stops at a convenience store. It is possible to run. If the vehicle accidentally deviates from the route, the vehicle may return to the destination route as early as possible. Therefore, if the alert information is stored only when the distance traveled out of the destination route is within the predetermined reference value range, only the information that is highly necessary is stored. be able to. of course,
Even when intentionally deviating from the route, such as when stopping at a convenience store as described above, the traveling distance may be short. In the case of the reference value range described above, it is considered that such a case often occurs by mistake, and thus such a determination is effective.

The reason why the distance traveled outside the route, which is a condition for storing the alert information, is not "not more than the reference value" but "the reference value range" is as follows. That is,
Since the mileage does not become a negative value, the lower limit value in the case of “below the reference value” is 0, so that the alert information is stored even when a small positive non-zero value occurs. It will be. However, an error is included in the sensor signal used for detecting the current position. Further, in the map data, there is actually an error in digitizing (digitizing) due to the fact that a planar (two-dimensional) road is represented by a line. Due to these errors, it is conceivable that it is determined that a slight departure from the destination route has occurred even though the vehicle is actually moving on the destination route. Therefore, if the value is “less than or equal to the reference value”, the alert information is stored even when the minute departure due to the above error occurs, and as a result, unnecessary attention is paid at the point where the vehicle travels along the destination route. Arousing is done.

Therefore, in order to exclude such a minute departure from the target, the lower limit value of the out-of-route mileage, which is a condition for storing the alert information, is set, and is set as a "reference value range" together with a predetermined upper limit value. It is. In addition, it is conceivable that the predetermined reference value range is set based on a road condition including at least a road density. In other words, even if the user consciously considers returning to the original destination route when deviating from the destination route, the distance required to return to the destination route is relatively high when the road density is high. This is because when the road density is low, it is assumed that the road length becomes relatively long. Therefore, in this case, the upper limit of the above-described reference value range is determined by the road density.

Further, as described above, the user may intentionally do so as a reason for traveling off the destination route. If the distance traveled out of the destination is within a predetermined reference value range, the information will be stored as the alert information, but the turning point in this case is not a situation where the alert is required for the user. . Therefore, as set forth in claim 4, there is provided a storage instruction input means by which a user can input an instruction to permit or prohibit the storage of the alert information in the alert information storage means, and to provide the instruction via the storage instruction input means. It is conceivable that the alert information is stored in the alert information storage means only when the storage permission of the alert information is instructed. In this way, since the alert information that the user does not need is not stored, unnecessary alert is not performed at the time of subsequent guidance.

In addition, the use of the alert information stored in the alert information storage means is not limited to permitting or prohibiting the storage of the alert information in the alert information storage means. The user can input an instruction to permit or prohibit, and only when the use permission of the alerting information is instructed through the use instruction inputting means, the guidance means is stored in the alerting information storage means. You may make it alert using alert information.

In addition to the above, it is conceivable that the alert information stored in the alert information storage means can be deleted according to an instruction from the user, as described in claim 6. For example, in the past, it was convenient for the user to be alerted at the branch point, but if it does not deviate from the route at the branch point after repeating it many times, the extra It will be an alert. Therefore, it is preferable that the deletion can be performed by the user's intention.

Further, it is assumed that the guidance means should be at least executable by outputting a voice from a voice uttering device, but a warning is executed by outputting a voice from a voice uttering device. Alternatively, it may be executed by displaying an image on a display device that displays characters and graphics on a screen. Considering current navigation systems and the like, it is common to provide visual guidance and auditory sense and to provide travel guidance by outputting audio along with screen display, so this is also preferable.

The advantage of performing the driving guidance by outputting a voice from the voice utterance device is that the driver does not need to shift his / her viewpoint to the display device, so that safe driving can be further ensured. And the like. Note that the navigation device of the present invention is presumed to be used by being mounted on a moving body, and is generally often mounted on a vehicle, but the same applies to a moving body other than a vehicle, such as a ship. It is possible to apply technical ideas.

[0022]

FIG. 1 is a block diagram showing the overall configuration of a navigation device 20 according to one embodiment of the present invention. The navigation device 20 is used by being mounted on a vehicle as a “mobile object”, and includes a position detector 24, a map data input device 26, an operation switch group 28,
The navigation ECU 30 connected to these, the navigation E
An external memory 32, a display device 34, and a speaker 35 which are connected to the CU 30 and correspond to "alert information storage means" are provided. The navigation ECU 30 is configured as a normal computer, and has a well-known CPU and R inside.
An OM, a RAM, an I / O, and a bus line for connecting these components are provided.

The position detector 24 is a GPS (Global Position) for detecting the position of a vehicle based on radio waves from a well-known gyroscope 38, a distance sensor 40, and satellites.
ingSystem).
Each of these sensors 38, 40, and 42 has an error having a different property, and is configured to be used while interpolating with a plurality of sensors. It should be noted that depending on the accuracy, a part of the above-described components may be used, and a rotation sensor for the steering wheel, a wheel sensor for each rolling wheel, or the like may be used.

The map data input device 26 is a device for inputting various data including map data and so-called map matching data for improving the accuracy of position detection. As a storage medium, CD-
A ROM or DVD is generally used, but other media such as a memory card may be used.

The display device 34 is a color display device. On the screen of the display device 34, a current vehicle position mark input from the position detector 24, map data input from the map data input device 26, and It is possible to superimpose and display additional data such as a guide route to be displayed on the map and a mark of a set point described later.

Further, the vehicle is configured to notify the driver of the traveling guidance by voice via the speaker 35,
Both the display on the display device 34 and the audio output from the speaker 35 can guide the driver to travel.
For example, in the case of a right turn, a content such as "Please turn right at the next intersection" is output by voice. If the driver is notified by voice, the driver can check the traffic information at the set point without moving the viewpoint, so that further safe driving can be achieved. Note that the display device 34 and the speaker 35 correspond to “guidance means” of the present invention.

The operation switch group 28 corresponding to the "memory instruction input means" and the "use instruction input means" is, for example, a touch switch or a mechanical switch integrated with the display device 34. Used for Then, when the position of the destination is input by the operation switch group 28, the navigation device 20 automatically selects an optimal route from the current position to the destination to form a guidance route, and the display device 34 It is provided with a so-called route guidance function for displaying and guiding by voice through the speaker 35. As a technique for automatically setting the optimum route, a technique such as the Dijkstra method is known.

Further, the navigation device 20 includes a communication device 44. The communication device 44 is for communicating with the information center 10 as an external transmission source. Examples of devices used as the communication device 44 include a mobile communication device such as an automobile phone or a mobile phone. Alternatively, a dedicated receiver may be used.

Here, the configuration of the information center 10 will be briefly described. The information center 10 collects by an external event collection device 12 that collects external events such as road conditions from various sensors S and the like mounted near the road, and various regulations and external event collection devices 12 together with a road map in the center area. A road network data storage device 14 in which various types of traffic information created based on the external events are stored;
A communication device 16 for communicating with a navigation device 20 mounted on a vehicle via a wireless line such as a car phone or a mobile phone; a position data (current position and destination) received from the navigation device 20 and a road network data storage device A control device 18 is provided for controlling a target road such as a traffic regulation or a traffic jam based on the information stored in the communication device 14 and transmitting the information via the communication device 16.

With such a configuration, the navigation device 20 performs the following operation. That is, after the power is turned on, the navigation ECU 30 uses the menu displayed on the display device 34 to switch the operation switch group 28 from the menu.
When the route information display process is selected in order to display the guide route on the display device 34 by operating, the following process is performed. That is, when the driver inputs the destination based on the map on the display device 34, the current position of the vehicle is obtained based on the satellite data obtained from the GPS receiver 42, and the Dijkstra method is used between the destination and the current position. The cost is calculated, and a process of obtaining the shortest route from the current position to the destination as a guidance route is performed.
Then, the guidance route is displayed on the road map on the display device 44 so as to guide the driver to an appropriate route.

Although such an operation is schematically illustrated, the characteristic processing executed by the navigation device 20 according to the present embodiment is performed when the travel guidance is performed based on the set destination route. When the vehicle deviates from the ground route, the information about the departed branch point and the destination route in the vicinity is stored as the alert information, and the stored alert information is used in the next and subsequent guidance. That is. Therefore, this point will be described in detail.

FIG. 2 is a flowchart showing a process relating to travel guidance and alerting. When the process starts,
In the first step S10, a route to the designated destination is set (route calculation), and when the destination route is set, route guidance is started (S20).

When the route guidance is started in S20, the next S3
At 0, it is determined whether or not the current position of the vehicle is on the destination route. If the current location is on the destination route (S30: YES), the process proceeds to S100 to determine whether or not the vehicle has arrived at the destination. If the vehicle has arrived at the destination (S100: NO), the present processing routine is ended. If the vehicle has not arrived at the destination (S100: Y).
ES), and proceeds to S110.

In S110, it is determined whether or not a predetermined distance Am from the branch point is present. The predetermined distance Am may be a fixed value, or may be changed according to the type of road. In addition, this "branch point" means all the branch points existing on the destination route.

If it is not a predetermined distance Am from the branch point (S110: NO), the process returns to S30 and repeats the process. If it is a predetermined distance Am from the branch point (S110: YES). It is determined whether or not the junction is a guidance junction. The “guide branch point” indicates only a branch point determined to require guidance from the road shape or the surrounding situation. Therefore, it is assumed that a branch point which merely passes when the vehicle travels along a so-called "road" does not basically correspond to all the branch points passing through on the destination route. For example, if a prefectural road with a small width is connected to a national road with a large width to form a branch point, and a destination route that runs along the national road is set, the branch point is not a guidance intersection. .

If it is a guidance junction (S120:
YES), a predetermined branch point guidance process is performed. In this branch point guidance processing, the traveling guidance for the branch point is provided by the speaker 3.
5 to indicate the distance to the junction and the direction of the turn, for example, "メ ー ト ル meters ahead, rightward", or "△△ meters ahead,
□□ Turn left at the 2nd intersection. "May be used to guide the user to the name of the branch point. of course,
The display device 34 may also display an enlarged view of the vicinity of the branch point and the turning direction.

On the other hand, if it is not a guidance junction (S120:
NO), it is determined whether or not the branch point (that is, the branch point determined to be before Am in S110) is a warning branch point. The “attention branch point” is determined to be necessary to alert the user in the future because the vehicle has deviated from the set destination route during the traveling so far, and the attention stored at S90. This is the branch point included in the arousal information. The processing of S90 will be described later.

Then, if it is a warning branch point (S14)
0: YES), a predetermined branch point alerting process is performed. That is, since the user has deviated from the destination route at the branch point so far, an alert is issued from the speaker 35 so as not to repeat the same error again. Please be careful. " Alternatively, determine the direction of travel from the road angle, etc., and note the way to pass the junction, such as "△△ meters ahead, the intersection at □□ 2-chome to the left." May be aroused. Of course, the display device 34 may display an enlarged view of the vicinity of the branch point and the traveling direction.

The branch point guidance processing in S130 or S1
After the branch point alerting process at 50 is completed, the process returns to S30 and repeats the process. In addition, a negative determination is made in S140,
That is, if the branch point determined to be before Am in S110 is neither the guidance branch point nor the alert branch point, the process directly returns to S30.

As described above, the predetermined branch point guidance processing (S130) is executed at the guidance branch point existing on the destination route set in S10, and the predetermined branch point warning processing is performed at the warning branch point. (S150) is executed. Even if the same destination route is set,
The alert branch point differs depending on the past history. That is, S
Since it depends on whether or not the information is stored as the alert information at 90, the alert branch point itself may not exist, and depending on the past history, the alert branch point may be considerably increased.

Next, a description will be given of a process when the alert information is stored. If a negative determination is made in S30, that is, if the current location is not on the destination route, the process proceeds to S40, and a point deviating from the destination route and a destination route near the destination are stored as “alert candidate information”. I do.
Since this is only the alert candidate information, it is determined in the processing of S50 to S80 whether or not to be formally adopted.

In step S50, measurement of the distance traveled outside the destination route (out-of-route travel distance) is started, and the subsequent step S50 is executed.
At 60, it is determined whether or not the current location is on the destination route, that is, whether or not the vehicle has returned to the destination route from a state where the vehicle has been running off the destination route. If the current location is on the destination route (S60: YES), S70.
Ends the measurement of the off-route traveling distance.

In S80, it is determined whether or not the out-of-route travel distance is within a predetermined reference value range. If it is within the reference value range (S80: YES), the "alert candidate information" stored in S40 is determined. Is formally stored as "alert information". On the other hand, if it is out of the reference range (S80: N
O), and return to S30 as it is. That is, when the vehicle deviates from the destination route, the "alert information" is stored only when the distance traveled outside the route is within the reference value range.

Here, the judgment in S80 is made as "reference value range".
This is because the upper limit value and the lower limit value are significant as described below. First of all, regarding the upper limit value, when traveling off the destination route, it will be mistakenly, and when intentionally deviating from the destination route, for example, when stopping at a convenience store etc. Since the vehicle may run, it is a device to store the alert information only when the vehicle accidentally comes off. If the vehicle accidentally deviates from the destination route, the vehicle may return to the destination route as early as possible.Therefore, if the travel distance outside the route is larger than the reference value, it is considered to be intentional. The alert information is not stored. Of course, even when intentionally deviating from the destination route, the traveling distance may be short, but when viewed relatively, the distance traveled out of the destination route is within a predetermined reference value range. Is determined in this way because it is likely that this has happened by mistake.

The lower limit is to avoid erroneous determination. That is, since the traveling distance does not become a negative value, the lower limit value in the case of “below the reference value” is 0, so that even if a small positive non-zero value is generated, the alert information is transmitted. It will be memorized. However,
Various sensors 38, 40, 4 constituting the position detector 24
The detection signal from 2 includes an error. Also, the map data read from the map data input device 26 actually has an error in digitizing (digitizing) due to the fact that a planar (two-dimensional) road is represented by a line. Due to these errors, it is conceivable that it is determined that a slight departure from the destination route has occurred even though the vehicle is actually moving on the destination route. Therefore, if the value is “less than or equal to the reference value”, the alert information is stored even when the minute departure caused by the above error occurs,
As a result, an unnecessary alert is issued at a point where the user has traveled along the destination route. Therefore, in order to exclude such minute separation from the target, a predetermined lower limit is set.

Then, the "reference value range" used in S80
Is set based on road conditions including at least the road density. In other words, even if the user consciously considers returning to the original destination route when deviating from the destination route, the distance required to return to the destination route is relatively high when the road density is high. This is because when the road density is low, it is assumed that the road length becomes relatively long.

When the vehicle returns to the destination route after erroneously deviating from the destination route in this way, the branch point of the point causing the deviation from the destination route is stored as the alert branch point. However, not only the branch point but also the destination route and the like in the vicinity are stored as a set as shown in S40. This is the same branch point,
For example, when approaching from the opposite direction or when the passing method of the branch point is different, it is not necessary to be a target of alert. In other words, depending on which destination route is set, the degree of the possibility of traveling in the wrong direction at that junction changes. It also stores what occurred when traveling on the route. In addition, since it is such a purpose, it is sufficient to have information about the links before and after the branch point on the destination route and the degree of the link that has deviated from the destination route. Therefore, the above-described S14
The determination as to whether or not the point is the alerting branch point at 0 is applicable only when the vehicle is traveling on the route stored as the alerting information.

As described above, according to the navigation device 20 of the present embodiment, every time the vehicle approaches a predetermined branch point to be guided on the set destination route, the traveling guidance for the branch point is provided. If the vehicle has deviated from the destination route while the travel guidance is being provided, the information on the deviated junction and the destination route near the junction is stored as alert information. deep.
Then, at the time of subsequent guidance, if the vehicle approaches the branch point targeted for the alert information on the same route as the destination route stored corresponding to the branch point, Alert.

Therefore, the user can be alerted at a branch point on a route where he has erroneously deviated from the destination route so far, which is effective in preventing the same erroneous departure from the route again. . By doing so, the branch point to be travel-guided can be limited to only predetermined ones existing on the destination route. Specifically, a junction that only passes when traveling along a road is not regarded as a “guide junction”. Therefore, for the user A who does not deviate from the destination route only by such branch point guidance, there is no need for extra guidance and no need to feel complicated. That is, it is possible to approach a state in which only the guidance required for the user A is performed, and the effectiveness and the usability of the guidance are improved.

On the other hand, for the user B who is deviated from the destination route if guidance is provided only at the guidance junction, at the junction that caused the departure from the destination route, the user is alerted at the next and subsequent guidance. Is made. Therefore, the user B can be brought close to a state where only necessary guidance is provided, and the effectiveness and usability of the guidance are improved.

That is, whether or not guidance is required depends on the user's feeling in many cases, and due to individual differences, it is not always necessary that all users have the same guidance at the same branch point. Therefore, in the present embodiment, since the branch point to be alerted is set based on the past history of each user, it is possible to respond to such a user-specific request.

As described above, the present invention is not limited to such an embodiment at all, and can be implemented in various forms without departing from the gist of the present invention. For example, in the above embodiment, based on the off-route traveling distance, if the traveling distance is within the reference value range, the information is stored as the alert information (S40 to S90). However, as described above, it is conceivable that the user may intentionally do so when traveling off the destination route, and if the distance traveled off the destination is within a predetermined reference value range. Is stored as the alert information. In this case, since the user does not need to be alerted at the branch point, it is preferable that the user can input an instruction to permit or prohibit the storage of the alerting information by operating the operation switch group 28, for example. . In this way, since the alert information that the user does not need is not stored, unnecessary alerts are not performed at the time of subsequent guidance.

Instead of permitting or prohibiting the storage of the alert information, the user may be able to input an instruction to permit or inhibit the use of the alert information stored in the external memory 32. In addition to this, when the user operates the operation switch group 28, the alert information stored in the external memory 32 is displayed on the display device 34.
May be displayed so that any alert information can be deleted. Until now, it was convenient for the user to be alerted at the branch point, but if it does not deviate from the route at the branch point after repeated many times, conversely, extra caution It is also expected to be evocative. Therefore, it is preferable that the deletion can be performed by the user's intention.

[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 illustrating a process executed by the navigation device of the embodiment.

[Explanation of symbols]

Reference Signs List 20 navigation device 24 position detector 26 map data input device 28 operation switch group 30 navigation ECU 32 external memory 34 display device 35 speaker 38 gyroscope 40 distance sensor 42 GPS receiver 44 Communication device

Claims (8)

[Claims] 1. Each time a vehicle approaches a predetermined branch point to be guided, which is present on a destination route set as a route for reaching a destination from a departure point, guidance for performing travel guidance for the branch point is provided. A navigation device for a moving object provided with a means, wherein when it is determined that the moving object has deviated from the destination route in a state in which the traveling guidance is provided by the guiding means, the vehicle is disengaged. A warning information storage unit that stores information about a branch point and a destination route near the branch point as warning information, and the guidance unit includes: a branch point that is a target of the warning information; If the moving body approaches on the same route as the destination route stored correspondingly, a warning about the junction is issued. 2. The alert information according to claim 1, wherein the alert information is stored in the alert information storage means only when the distance traveled out of the destination route is within a predetermined reference value range. A navigation device, characterized in that: 3. The navigation device according to claim 2, wherein the predetermined reference value range is set based on a road condition including at least a road density. 4. A storage instruction input unit according to claim 1, wherein a user can input an instruction to permit or prohibit storage of the alert information in the alert information storage unit. A navigation information storage unit that stores the alert information in the alert information storage unit only when an instruction to store the alert information is given through the storage instruction input unit. 5. The use instruction according to claim 1, wherein the user can input an instruction to permit or prohibit use of the alert information stored in the alert information storage means. The guide means is provided with input means, and only when the use permission of use of the alert information is instructed through the use instruction input means, the guide means uses the alert information stored in the alert information storage means. A navigation device. 6. The navigation device according to claim 1, wherein the alert information stored in the alert information storage means can be deleted in accordance with an instruction from a user. A navigation device, characterized in that: 7. The navigation device according to claim 1, wherein said guidance means alerts by outputting at least a voice from a voice generating device. 8. The navigation device according to claim 1, wherein the guidance unit executes the alert by outputting the alert by voice from the voice generating device, and displays characters or characters on a screen. A navigation device characterized by being configured to be executable also by displaying an image on a display device that displays a figure.