JPH09210708A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a wasteful consumption of memory when in use without causing the deterioration in the operational performance for a user in a navigation device in which location data showing driver's own location are stored one after another while travelling. SOLUTION: When the data on latitude and longitude are obtained while travelling, whether the data of a location whose distance to the present location indicated by the newly obtained data on latitude and longitude is under a certain level already resides in a storage device is judged (SD9). When it does not reside ('NO' SD9), the value of a memory flag MFLG is altered to the value '1' which permits the obtained data on latitude and longitude to be stored in the storage device. Contrarily when it resides ('YES' SD9), the value of the memory flag MFLG is processed to maintain to be the value '0' which inhibits the obtained data on latitude and longitude to be stored in the storage device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device capable of displaying a traveling locus.

[0002]

2. Description of the Related Art Conventionally, in-vehicle navigation devices that have been widely used have a function of guiding a vehicle to a destination while displaying the position of the vehicle on a map displayed on a monitor screen. A function of displaying a traveling locus for displaying a traveling locus when traveling in the past on a map is provided, if necessary, by storing the traveling position of the user's own vehicle with time. Then, by using such a function, it is possible to confirm the route from the starting point to the destination in the past. In addition, in a navigation device having such a function, a user can generally select whether to store the traveling position or display the traveling locus or stop the traveling position.

[0003]

However, in such a navigation device, when the traveling position is stored and the traveling locus is displayed, the above-mentioned memory and display are performed even though the vehicle is traveling on the same road again. However, there is a problem that the memory is wasted, for example, by repeating. Needless to say, such a situation can be avoided to some extent by the user frequently performing the above-described storage and display stop operation, but this is not realistic because the operability is significantly reduced.

The present invention has been made in view of such conventional problems, and provides a navigation device which prevents unnecessary memory consumption during use without deteriorating the operability of the user. The purpose is to

[0005]

In order to solve the above problems, according to the invention of claim 1, position data acquisition means for acquiring self position data indicating the current self position and acquisition by the position data acquisition means. In a navigation device including a storage unit that sequentially stores the self-position data thus generated when moving, and a display unit that can display a self-movement locus on a map based on the storage position data stored in the storage unit,
When the storage unit has storage position data indicating a position whose distance is less than or equal to a fixed value with respect to the position indicated by the self-position data acquired by the position data acquisition unit, the storage unit of the acquired self-position data It was equipped with a control means for prohibiting memory.

In such a configuration, the control means is configured to store the stored position data indicating a position whose distance is less than or equal to a fixed value with respect to the position indicated by the self-position data acquired by the position data acquisition means in the storage means. The storage of the acquired self-position data in the storage means is prohibited.
For this reason, when the route that has been once passed is re-passed, it is automatically prohibited to store new self-position data, which is already unnecessary for displaying the movement locus indicating the route, in the storage means.

Further, in the invention of claim 2, the position data acquisition means for acquiring the self position data indicating the current self position and the position data acquired by the position data acquisition means are sequentially stored at the time of movement. In a navigation device comprising a storage means for storing, and a display means capable of displaying a movement locus of the user on a map based on the storage position data stored in the storage means, when acquiring the self-position data by the position data acquisition means, Status data acquisition means for acquiring status data indicating the status at the time of movement; specific condition setting means for setting specific conditions limited based on the content of the status that the status data acquisition means can acquire as status data; When the situation indicated by the situation data acquired by the data acquisition means corresponds to the specific condition set by the specific condition setting means Was that a control means for inhibiting storage in the memory means of the self-position data acquired by the position data acquiring means.

In such a configuration, when the position data acquisition means acquires its own position data during movement, the situation data acquisition means obtains situation data indicating the situation at the time of movement, and the situation data acquired at that time is The specific condition set by the specific condition setting means, that is, the specific condition limited based on the content of one or more situations that the situation data acquisition means can obtain as situation data, for example, an arbitrary date, time, speed, or those When the situation limited by the combination is applicable, storage of the self-position data acquired by the position data acquisition unit in the storage unit is prohibited. Therefore, by setting as a specific condition a situation in which the movement trajectory is not desired to be displayed or a situation in which the movement trajectory is not required to be displayed, it is possible to store the self-position data acquired under such a situation during movement. Can be banned automatically.

Further, in the invention of claim 3, the status data acquisition means acquires status data indicating a day of the week and status data indicating a time. With this configuration, weekday commuting hours and the like can be set as the specific condition.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a block diagram showing a vehicle-mounted navigation device showing an embodiment of the present invention. This navigation device has a function of storing the vehicle position over time and displaying the traveling locus on the map as needed, and a function of simultaneously storing the vehicle position and simultaneously displaying the traveling locus on the map. The antenna 1 installed on the roof of the vehicle body, and the C / A code in the L1 band from the satellite received by the antenna 1 are demodulated and decoded by the despreading LSI to obtain the latitude / longitude of the current location. That is, it has the GPS block 2 for calculating the self-position data indicating the current self-position. The GPS block 2 is connected to the graphic block 3, and the graphic block 3 is connected to the CD block 4 and the monitor block 5, respectively. In CD block 4,
For example, a CD-ROM conforming to the format of the Navigation Study Group, which stores map data including various road information such as intersection position data, is mounted. The monitor block 5 is installed on the instrument panel in the vehicle compartment and has a dot type monitor (not shown) as a display means.

On the other hand, in the graphic block 3, RO
A CPU 8 for implementing the control means and the specific condition setting means of the present invention for controlling the entire apparatus based on the program stored in M6 and the data stored in the RAM 7 is provided. The CPU 8 mainly uses the CPU based on the latitude / longitude data of the current location sent from the GPS block 2.
Map data such as map information around the present location and road information is called from the CD block 4 via the peripheral circuit G / A 9.
Then, such information is sent to the monitor block 5 as a video signal via the graphic controller 11 to which the video RAM 10 is connected. As a result, a road map or the like is displayed on the screen of the monitor, which is the display means provided in the monitor block 5. In addition, the peripheral circuit G / A9 of the CPU is provided with a remote control type input key.
12 are connected. The input KEY 12 is provided with a plurality of operation keys, and the CPU 8 is adapted to perform various operations according to those operations. In addition, the G
With the PS block 2, the position data acquisition means of the present invention is
The situation data acquisition means of the present invention is realized by the GPS block 2 and a vehicle speed sensor (not shown) provided in the automobile.

Further, the RAM 7 is the storage means of the present invention, and as shown in FIG. 2, the RAM 7 stores the self-acquired data at each of the positioning points 1, 2, 3 ... N. Position data, that is, latitude and longitude data,
Along with that, multiple situation data indicating the driving situation that changes sequentially according to the traveling position, that is, altitude, speed, direction, date, hour, minute, second, positioning state, route number data, A locus memory area for sequentially storing is secured. Here, the hour, minute, second is the passing time of each positioning point, and the positioning state is the number of satellites that can be simultaneously received at each positioning point.

Next, the operation of this embodiment having the above configuration will be described below with reference to the flowchart showing the processing contents of the CPU 8. FIG. 3 is a flow chart showing an operation in the case where a locus processing mode for displaying a running locus is selected by operating the input key 12 while sequentially storing the running position of the own vehicle during running. That is,
When the trajectory processing is selected, the CPU 8 first determines whether or not the traveling distance L exceeds the trajectory display interval L0 (100 m in the present embodiment) (SA1), and when it exceeds, the subsequent processing is executed. , The trajectory processing is terminated without doing anything else, and the process returns to the main flow (NO in SA1). Here, when the traveling distance L exceeds 100 m (YES in SA1),
The GPS interrupt process shown in FIG. 4 is temporarily masked (SA2), and the value of the traveling distance L is set to L-
After updating to the value of L0 (SA3), the mask state of the GPS interrupt process is released (SA4). In addition,
The GPS interrupt processing is performed every one second,
In such processing, first, the GPS block 2 is used to set the latitude,
After the process of acquiring the position data and the situation data such as longitude and altitude (SB1), the traveling distance L is calculated.

On the other hand, after canceling the masked state of the GPS interrupt process, after the route number process described later is performed (SA5), it is determined whether the memory flag MFLG is "1" (SA6). The result of this judgment is YES
In the case of, each data of latitude, longitude, altitude, speed, azimuth, date, hour, minute, second, positioning state, route number acquired by the GPS interrupt process described above is written at the address indicated by the write address ADRW. In sequence from the beginning, the locus symbol processing is performed after the loci are stored in the locus memory area of the RAM 7 (SA7 to SA15) (SA16). In the trajectory symbol processing, as shown in FIG. 5, speed data is first read from the RAM 7 (SC1), and the speed of the read data is determined in which of three predetermined speed ranges is included. Yes (SC2). And the speed is 2
In case of up to 0 km / h, set the symbol display number to 1 (SC
3) When the speed is 20 to 40 km / h, the symbol display number is set to 2 (SC4), and when the speed exceeds 40 km / h, the symbol display number is set to 3 (S4).
C5).

Here, the locus symbol is 16 dots displayed on the screen to show the running locus as shown in FIG.
It is a 16-dot mark, and the number of symbols displayed is
It is a number indicating how many such trajectory symbols M are displayed side by side at the same point (see FIG. 7). Subsequently, in the trajectory symbol processing, the azimuth data is read from the RAM 7 (SC6), and the symbol rotation angle is calculated and set according to a predetermined procedure according to the azimuth of the read data (SC7).

Next, when the trajectory symbol processing is finished,
A locus display address process is performed (SA17). In this process, the data of latitude and longitude for specifying the position on the map where the symbol should be displayed in the RAM 7 is stored.
The address of the locus memory area of M7 is searched and the stored data is read. Subsequently, the locus display process displays the locus symbol M of FIG. 6 in a state in which the locus symbol M of FIG. 6 is rotated according to the symbol rotation angle set in the above-described locus symbol process, at the position indicated by the read latitude and longitude data. At the same time (SA18), the symbol display number corresponding to the point number is subtracted (SA19). Next, it is judged whether or not the number of displayed symbols is "0" (SA20),
If the determination result is NO, the process returns to step SA15, and as many trajectory symbols M as the number of symbols are thereby displayed. On the other hand, the determination result of step SA6 is NO.
If (memory flag MFLG is "0"), the trajectory processing is terminated without performing the processing of step SA7 and the subsequent steps, and the process returns to the main flow. That is, only when the memory flag MFLG is "1", the acquired self-position data and situation data are stored in the trajectory memory area of the RAM 7, and the trajectory symbol M is displayed based on the stored data.

That is, the locus process is repeated during traveling, so that the self-position data and the situation data are sequentially stored in the locus memory area of the RAM 7 except for the case where the memory flag MFLG is "0", and a plurality of stored plural data are stored. Based on the storage position data, the trajectory symbol M on the screen as shown in FIG. 7 corresponds to the traveling locus L and the velocity and direction (traveling direction) that changes every time the vehicle travels a certain distance, that is, the storage position data. Status data is displayed. That is, in addition to the position data that is the basis for displaying the travel locus L, situation data that provides information regarding the driving situation is displayed. As a result, the driver can obtain not only the traveling locus L at that time, but also information such as the presence / absence of congestion during traveling and the degree thereof.

Here, the processing contents of the above-mentioned route number processing (step SA5) will be described with reference to the flowchart of FIG. In this route number processing, first, "0" is set in the memory flag MFLG (SD1), and the head address ADRS of the locus memory area secured in the RAM 7 is set as the read address ADRR (SD2).
Next, the latitude data stored in the read address ADRR, that is, the latitude data of the point number 1 is stored in the RAM 7
(SD3). Then, after advancing the read address ADRR by 3 bytes and adjusting the read address ADRR to the latitude data (SD4), the latitude indicated by the read latitude data exists in the range between the upper end and the lower end of the currently displayed map. It is determined whether or not (SD5).
If the result of this determination is YES, point number 1
Of the longitude data is read from the RAM 7 (SD6), and it is determined whether the longitude indicated by the read longitude data exists in the range between the left end and the right end of the currently displayed map (SD7).

Then, the determination result of step SD5 is NO.
In the case of, or the judgment result of step SD7 is NO,
That is, if the position indicated by the latitude and longitude data of the point number 1 is outside the range of the map currently displayed, the process proceeds to step SD10. In step SD10, the read address ADRR is added by 20 bytes, and the read address ADRR is set to the head address in which the data of the next point number is stored. Next, read address A
It is determined whether or not the value of DRR is larger than the final address of the locus memory area secured in the RAM 7 (step S
D11), if the result of this determination is NO, step S
Returning to D3, the above-described processing of SD3 to SD10 is repeated. If the determination result is YES, step SD
After proceeding to 12, the memory flag MFLG is set to "1" (SD12), the process is terminated, and the process returns to the trajectory process of FIG.

On the other hand, step SD5 and step SD7
Is YES and the position indicated by the read latitude and longitude data is within the range of the currently displayed map, the position indicated by the read latitude and longitude data, The above-mentioned GPS interrupt processing (see FIG. 4)
The distance LCONT from the current position acquired in (see) is calculated (SD8). Next, it is determined whether or not the calculated distance LCONT is equal to or less than a preset determination distance L1 (for example, 100 mm) (SD9), and if the result of this determination is NO, the process proceeds to step SD10 described above. On the other hand, the judgment result is Y
If it is ES and the storage position data indicating the position where the distance from the current position is equal to or less than the fixed value exists in the locus memory area of the RAM 7, the process is ended with the memory flag MFLG set to "0". Return to the trajectory processing of FIG. Therefore, when the locus memory area of the RAM 7 has stored position data indicating a position whose distance from the position at that time is equal to or less than a certain value, the process ends without performing steps SA7 to SA20 in the above-described locus process. To do. That is, storage of the acquired self-position data and situation data and display of the trajectory symbol M based on these data are prohibited.

Therefore, when the vehicle once again travels a route which has been traveled once during traveling, the storage of new self-position data which is not already necessary for displaying the moving locus indicating the route is automatically prevented. Therefore, it is possible to prevent wasteful consumption of the memory in the RAM 7 or the like during use without causing the user to perform complicated operations. Further, as mentioned above,
When moving while sequentially displaying the movement trajectory,
When the route that has been once passed is passed again, the movement loci are automatically prevented from being displayed in an overlapping manner. For example, as shown in FIG. 9, the previous travel route is (A → B → C),
When the current traveling route is (A → B → D), the locus symbol M is not displayed overlaid on the overlapping route (A → B). Therefore, it is possible to prevent wasteful memory consumption even in the video RAM 10 used for displaying the movement track. It should be noted that such an effect is similarly obtained even when the self-position data is not stored.

On the other hand, in the above-described navigation device, the vehicle position can be sequentially stored without displaying the traveling locus during traveling, and the past traveling locus can be displayed later if necessary. In that case,
After the processing of steps SA1 to SA15 in the flowchart shown in FIG. 4 is once performed, the trajectory reading processing described later is performed. Therefore, even in that case, the effect of preventing wasteful consumption of memory in the RAM 7 can be obtained.

The CPU in the trajectory reading process
The processing operation of No. 8 is shown in FIG. That is, input KEY1
When the trajectory reading process is selected by the operation of 2, CP
The U8 initially sets the read address ADRR to the start address of the locus memory area in the RAM 7 (SE1). Next, it is determined whether or not the read address value ADRR is the final address value ADRE of the locus memory area. If the result of the determination is YES, all the processes are terminated and the process returns to the main flow (not shown). On the other hand, when the determination result is NO, the latitude data stored at the address indicated by the read address value ADRR is read from the RAM 7 (SE3), and further the longitude data is read (SE4).

Then, the locus display range is determined, that is, the process of determining whether or not the point specified by the read latitude data and longitude data is within the display range of the map displayed on the screen at that time. Perform (SE5).
Next, as a result of the determination process, it is determined whether or not the point is within the display range. If NO, the read address value ADRR is incremented and the process returns to step SE2. On the other hand, if the determination result is YES, the latitude data and the longitude data already read are followed by the altitude,
Each status data of speed, direction, date, hour, minute, second, and positioning state is sequentially read from the RAM 7 (SE7 to SE1
2).

Next, after performing the trajectory symbol processing described with reference to FIG. 5 (SE13), the trajectory display address processing is performed (SE14). In this address processing, the read address value ADRR is added for one point number (23 bytes in this embodiment). Subsequently, the locus display processing is performed, and the latitude read in steps SE3 and SE4,
At the position indicated by the longitude data, the trajectory symbol M of FIG.
It is displayed in a rotated state according to the symbol rotation angle set in the trajectory symbol processing (SE15). Also, after subtracting the number of displayed symbols corresponding to that point (SE1
6) It is determined whether the number of displayed symbols has become "0" (SE17). Then, if the determination result is NO, the process returns to step SE14, and as a result, the trajectory symbols M are displayed by the number of symbols. If YES, the process returns to step SE2, and the determination result of step SE2 is NO.
Until, that is, until all the data in the trajectory memory is read out, the above-mentioned processing is repeated.

As a result, the input key 12 is input as required.
As in the case of the trajectory processing described with reference to FIG. 3, the operation changes with the symbol mark as shown in FIG. 7 on the screen every time the vehicle travels a certain distance from the past trajectory L of the vehicle. Situation data corresponding to the speed and azimuth (direction of travel), that is, the storage position data is displayed.

On the other hand, in the above description, the storage of the acquired self-position data in the RAM 7 is prohibited based on the fact that the memory flag MFLG is set to "0" in the route number processing. Apart from this, in the navigation device described above, unnecessary position data can be prevented from being stored in the RAM 7 even in the following manner.

First, by the situation setting process shown in FIG.
The user is allowed to set in advance a specific situation in which display of the movement track is unnecessary. In such a process, by operating the input KEY 12, a situation to be used for limiting the specific situation is selected (SF1), and then the condition content is designated for the selected situation (SF2). The conditions that can be selected in step SF1 are those that can be acquired by the navigation device including the altitude, speed, azimuth, date, hour, minute, second, and positioning state described above. Further, the designation in step SF2 can be performed by individually designating the content according to the target condition or by designating the range. For example, when the selected situation is hour, minute, second, that is, time, an arbitrary time or a time zone from one time to another time can be designated. Then, in the subsequent step SF3, it is selected whether or not the setting is performed for other different situations. If the setting is performed, the process returns to step SF1 (YES), and if not performed (NO), the setting is performed in step SF1 and step SF2. The stored data is stored as specific data in a predetermined memory area secured in the RAM 7 (SF4), and then the process ends.

Then, in the navigation device, when the locus processing mode is selected and the user sets a specific situation, the CPU 8 causes the navigation device shown in FIG.
At the time of executing the locus display processing already described in step SA5
After the (route number processing), the specific situation processing shown in the flowchart of FIG. 12 is performed. That is, in the specific situation process, first, "0" is set in the memory flag MFLG (SG1), and then the specific data stored in the RAM 7 is read (SG2). Next, the content of the situation set in the read specific data is compared with the content indicated by the corresponding situation data among the situation data acquired by the above-mentioned GPS interrupt processing (SG3), and the corresponding situation data is obtained. It is determined whether or not the contents shown by all correspond to the contents of the conditions set in the specific data (SG4). When the result of this determination is NO, the memory flag MFL
After setting "1" to G (SG5), the process is terminated and returns to the trajectory process of FIG. On the contrary, when the result of the determination is YES, the process is terminated with the memory flag MFLG set to "0" and the process returns to the trajectory process of FIG.

Therefore, when the traveling condition matches the preset specific condition, the trajectory processing of FIG. 3 is terminated without performing the steps SA7 to SA20 described above.
That is, storage of the acquired self-position data and situation data, and display of the trajectory symbol M based on those data are prohibited. For example, when the time zone from a certain time to another time is set as the specific situation, the storage of the self-position data and the display of the traveling locus in the time zone are prohibited. Also, as a specific situation, when the condition that the number of satellites that can be simultaneously received is two or less is set, when the number of satellites that can be simultaneously received is 1 or 2, the storage and storage of position data and Display of the running track is prohibited. As a result, the storage of unnecessary position data acquired under the situation where the user does not want to display the traveling locus or the situation where the display of the traveling locus is unnecessary is automatically prohibited. Therefore, it is possible to prevent wasteful consumption of the memory due to storage of unnecessary self-position data without causing the user to perform a complicated operation.

The navigation device described in the present embodiment uses the date data (year / month / day) as status data.
At the same time, the day of the week can be calculated from the date and the data can be acquired as another status data, and the commuting time zone on weekdays can be set as the specific status. In that case, the storage of the self-position data and the display of the traveling locus can be automatically prohibited when traveling on a commuting route or the like that hardly needs to display the traveling locus, and the usability is improved. Further, the acquired latitude and longitude data may be used not only as self-position data but also as situation data. In that case, as the above-mentioned specific situation, for example, by setting the position of latitude and longitude data indicating the position near the home, it is possible to store the self-position data when traveling near the home. It can be prohibited automatically. In the present embodiment,
The in-vehicle navigation device that obtains the position data (latitude, longitude) indicating the position of the own vehicle by GPS is shown.
The present invention is not limited to this, and the present invention can also be applied to a navigation device equipped with another positioning method such as autonomous navigation in which the vehicle position is acquired by a speed sensor, a gyro sensor, a direction sensor, or the like.

[0032]

As described above, in the navigation device according to the first aspect, when the route which has been once passed is passed again, new self-position data which is not already necessary for displaying the moving locus indicating the route is stored in the storage means. Since the storage is automatically prohibited, it is possible to prevent wasteful consumption of the memory due to unnecessary position data during use without causing the user to perform a complicated operation.

Further, in the navigation device according to the second aspect, the specific condition set by the specific condition setting means, that is, the specific condition limited based on the content of the status that the status data acquiring means can acquire as the status data, for example, the movement. By setting the situation where you do not want to display the trajectory or the situation where you do not need to display the movement trajectory, the storage of the self-position data acquired under such circumstances is automatically prohibited during movement. I chose Therefore, it is possible to prevent useless consumption of the memory due to storage of unnecessary position data during use without causing the user to perform a complicated operation.

In addition to this, in the navigation device of the third aspect, the status data acquisition means acquires the status data indicating the day of the week and the status data indicating the time, and sets the commuting time zone on weekdays as the specific status. I made it possible.
Therefore, it is possible to automatically prohibit the storage of the position data when moving on a commuting route that hardly needs to display the movement locus, which improves usability.

[0035]

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a data storage structure in a trajectory memory area provided in the RAM of FIG.

FIG. 3 is a flowchart showing trajectory processing according to the embodiment of the present invention.

FIG. 4 is a flowchart showing GPS interrupt processing in the same embodiment.

FIG. 5 is a flowchart showing trajectory symbol processing in the same embodiment.

FIG. 6 is an enlarged view showing a trajectory symbol according to the same embodiment.

FIG. 7 is a diagram showing a display example of a screen relating to trajectory processing and trajectory reading processing in the same embodiment.

FIG. 8 is a flowchart showing route number processing in the same embodiment.

FIG. 9 is a diagram showing a display example of another screen related to the trajectory processing and the trajectory reading processing in the same embodiment.

FIG. 10 is a flowchart showing a trajectory reading process in the same embodiment.

FIG. 11 is a flowchart showing a situation setting process in the same embodiment.

FIG. 12 is a flowchart showing a specific situation process in the same embodiment.

[Explanation of symbols]

 2 GPS block 4 CD block 5 Monitor block 7 RAM 8 CPU L Running locus (moving locus) M Locus symbol

Claims (3)

[Claims] 1. A position data acquisition unit for acquiring self position data indicating a current self position, a storage unit for sequentially storing the self position data acquired by the position data acquisition unit, and a storage unit for storing the self position data. In a navigation device comprising a display unit capable of displaying a movement locus of the user on a map based on stored storage position data, the storage unit stores the position indicated by the self-position data acquired by the position data acquisition unit. A navigation device, comprising: a control unit that prohibits storage of the acquired self-position data in the storage unit when there is stored position data indicating a position whose distance is equal to or less than a certain value. 2. A position data acquisition unit for acquiring self position data indicating a current self position, a storage unit for sequentially storing position data acquired by the position data acquisition unit, and a storage unit for storing the position data. In a navigation device equipped with a display unit capable of displaying a self-movement locus on a map based on the stored position data, when acquiring the self-position data by the position data acquisition unit, status data indicating a situation at the time of movement is acquired. Status data acquisition means, specific condition setting means for setting specific conditions limited based on the contents of the status that the status data acquisition means can acquire as status data, and status data acquired by the status data acquisition means. When the situation shown corresponds to the specific condition set by the specific condition setting means, the position data acquisition means A navigation device comprising: a control unit that prohibits storage of the acquired self-position data in the storage unit. 3. The navigation device according to claim 2, wherein the status data acquisition unit acquires status data indicating a day of the week and status data indicating a time.