JPH11248485A - Navigation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a navigation system in which the image display unit can be separated from the body and carried while displaying an image by constructing the image display unit as an independent body being mounted removably on the body section. SOLUTION: A removable display unit 12 is normally connected through wiring 13 with a navigation system section 11 and operated with power being supplied from a power supply section 14 to store an image display data DSP delivered from a display data forming section 25 in a display data memory 43 and to display it at an image display section 46. When the unit 12 is separated from the system section 11, it is fed with power from an auxiliary batter power supply 41 to read out the data DSP from the memory 43 before separation in response to an operation control signal CMR and display the map of final screen at the section 46 through an image signal forming section 45. Since the unit 12 can be separated and carried, it is not required to remember or note the route to a building being visited from a parking lot, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle mounted on a vehicle, which detects a current position of the vehicle, and displays an image of navigation information such as map information including an index indicating the detected current position. The present invention relates to a navigation device that provides information to passengers.

[0002]

2. Description of the Related Art Various road running support systems for vehicles have been developed. As one of such road running support systems, for example, image display means provided in a vehicle compartment forming section of a vehicle, for example, has been used. Road map information in a predetermined area including the travel range of the vehicle is displayed as a map image, and the position and the like of the vehicle are displayed as an image superimposed on the map image to provide information on road travel to the occupants of the vehicle. A navigation device to be performed has been proposed. The provision of information to the occupant of the vehicle by such a navigation device is performed, for example, under the condition that the current position of the vehicle is detected, and the current position of the vehicle is sequentially displayed on a map image. In this way, a vehicle that contributes to the understanding of the traveling condition or traveling environment of the vehicle by the occupant, or a route that is scheduled or set to travel by the vehicle is displayed by being superimposed on a map image, It is assumed that the burden on the occupant in the driving state is reduced.

A conventionally proposed navigation device mounted on a vehicle as described above is, for example, a position detecting unit for detecting the current position of the vehicle and transmitting the current position data, and transmitting map data representing a map. Map data providing unit, a display data forming unit for obtaining image display data based on the current position data from the position detecting unit and the map data from the map data providing unit, an operation control unit for controlling the operation of each unit, a power supply unit An apparatus main body unit that includes the like, and an image display unit that is separate from the apparatus main body unit and that displays an image based on image display data obtained from a display data forming unit in the apparatus main body unit, Installed in the vehicle. In particular, the image display unit uses, for example, a relatively small liquid crystal panel for image display, and is provided near the driver's seat in the cabin of the vehicle.

Such an image display section is mechanically formed separately from the main body of the apparatus, but is used after being electrically connected to the main body of the apparatus. In addition to receiving power supply from the provided power supply unit, image display data obtained in the display data forming unit in the apparatus main body is supplied, and is controlled by an operation control unit in the apparatus main body. Therefore, the image display section does not function in a state of being separated from the apparatus main body, but can perform an image display operation while being connected to the apparatus main body through wiring.

[0005]

As described above, in the navigation device proposed in the prior art, the image display unit receives power supply from the power supply unit provided in the device main unit, and receives the power from the power supply unit provided in the device main unit. The image display data obtained in the display data forming section in the section is supplied, and under the control of the operation control section in the apparatus main body section, an image is displayed based on the image display data from the display data forming section. . Therefore, disadvantages resulting from such matters are brought.

Such inconvenience appears, for example, in that the user of the navigation device cannot remove only the image display unit from the vehicle and carry it outside the vehicle and use it as a portable device outside the vehicle. Therefore, for example, when the user of the navigation device visits a specific building, the user refers to the navigation information provided as an image by the image display unit of the navigation device, In a situation where the vehicle goes to the parking lot, and then leaves the vehicle in the parking lot and arrives at a specific building, the user must remember the map information displayed on the image display unit of the navigation device, or Then, a situation arises in which the user must write it down on appropriate paper or the like.

That is, the user who has made the vehicle reach the parking lot must be ignorant of the route from the parking lot to the specific building, or must travel through a relatively complicated route from the parking lot to the specific building. If not, the user must rely on the map information displayed on the image display section of the navigation device when leaving the vehicle at the parking lot, that is, the map information on the final screen when arriving at a specific building. become. At that time, the image display unit of the navigation device cannot be carried in a state where the map information of the final screen is displayed as an image, so that it is unavoidable to memorize the map information of the final screen, or It is necessary to write it down on paper or the like. This leads to a situation in which the user has considerable inconvenience.

[0008] In view of the above, the invention described in the claims of the present application is intended to be mounted on a vehicle and used.
A position detector for transmitting current position data of the vehicle,
A map data providing unit that sends map data representing a map, a display data forming unit that obtains image display data based on current position data and map data, an operation control unit that controls the operation of each unit, a power supply unit, etc. The device body, and the device body is separate from the device body, provided with an image display unit that displays an image based on image display data obtained from the display data forming unit in the device body,
The part including the image display unit is separated from the device main unit,
It can be carried in a state in which an image based on image display data can be displayed by the image display unit. In addition, the present invention provides a navigation device capable of performing other functions.

[0009]

A navigation device according to the invention described in any one of claims 1 to 6 in the claims of the present application detects the current position of a vehicle and converts the current position data. A position detection unit to send out, a map data providing unit to send out map data representing a map, a display data formation to obtain image display data representing navigation information based on the current position data from the position detection unit and the map data from the map data providing unit. A navigation operation control unit for controlling a unit, a position detection unit, a map data providing unit, and a display data forming unit; a navigation system unit including a main power supply unit;
Memory means detachably provided to the system section for storing image display data from the display data forming section, display section for displaying navigation information representing image display data read from the memory means, image display section, memory means and display section And a detachable display unit including an auxiliary battery power supply.

In particular, in the navigation apparatus according to the second aspect of the present invention, the detachable display unit includes an input operation unit connected to the display operation control unit, and the operation control through the input operation unit is performed. The operation can be performed.

According to a third aspect of the present invention, in the navigation apparatus, the detachable display unit includes a data communication unit provided in the display operation control unit, and the navigation system using the data communication unit. The data communication with the navigation operation control unit in the unit can be performed.

Further, in the navigation apparatus according to the invention described in claim 4, the detachable display unit includes an information transmitting / receiving section for receiving information from outside and transmitting information to outside. You.

[0013] In the navigation device according to any one of the first to sixth aspects of the present invention configured as described above, the navigation information represented by the image display data is displayed. A portion including a display unit for displaying an image, in addition to the display unit, a memory unit for storing image display data from a display data forming unit in the navigation system unit, and a display operation control unit for controlling the memory unit and the display unit , And an auxiliary battery power unit, and is a detachable display unit that is detachably attached to the navigation system unit. Therefore, when the portion including the display section for displaying the navigation information represented by the image display data on the image, that is, the detachable display unit section is separated from the navigation system section, the power is supplied from the auxiliary battery power supply section. The portable device can be carried in a state where an image can be displayed based on image display data by the display unit.

In the navigation apparatus according to the second, third, or fourth aspect of the present invention, the detachable display unit includes a display operation control unit. A data communication unit provided in the display operation control unit, and a navigation system unit provided with the data communication unit, the operation system being capable of performing operation control operations through the input operation unit. , Or an information transmission / reception unit that receives information from outside and transmits information to outside. This allows the detachable display unit, which includes the display unit for displaying the navigation information represented by the image display data, to be displayed on the display unit in addition to the display of the image based on the image display data by the display unit while being carried. Thus, it can also perform various other functions.

Therefore, according to the navigation apparatus according to any one of the first to sixth aspects of the present invention, for example, a user of the navigation apparatus visits a specific building. In the case, the user refers to the navigation information provided as an image by the image display unit of the navigation device, goes by car to a parking lot near a specific building, and then leaves the vehicle in the parking lot. In a situation where a user arrives at a specific building, the user who caused the vehicle to reach the parking lot is ignorant of the route from the parking lot to the specific building, or the route is relatively complicated from the parking lot to the specific building. The user must carry the detachable display unit separately from the navigation system, even if For example, it is possible to avoid a situation in which map information of the final screen displayed as an image on the display unit has to be memorized or written down on a suitable paper or the like, thereby relieving the trouble of the conventional device. You.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a navigation device according to any one of claims 1, 5 and 6 of the present application.

The example shown in FIG. 1 includes a navigation system section 11 mounted on a vehicle, and a detachable display unit section 12 which is detachably mounted on the navigation system section 11. ing. The detachable display unit 12 includes the navigation system 1
When placed in a state of being connected to 1, an electrical connection with the navigation system unit 11 is made through the wiring 13.

The navigation system section 11 includes a power supply section 14 forming a main power supply section.
4 to operate. The power supply section 14 forming the main power supply section forms a power supply voltage based on a battery voltage from a vehicle battery mounted on the vehicle.

The navigation system unit 11 has a position detection for detecting the current position of the vehicle using a GPS signal from an artificial satellite in a global positioning system (GPS) which is a radio navigation system using an artificial satellite. A part 15 is included.

The position detector 15 selectively receives a GPS signal and performs predetermined processing obtained from a GPS signal antenna 16 and a GPS signal receiver 17 for performing predetermined processing on the received GPS signal. The GPS signal SG is
The current position is supplied to the current position detector 18. Current position detector 18
In addition to the GPS signal SG from the GPS signal receiving unit 17, an azimuth detection output S corresponding to the traveling direction (azimuth) of the vehicle from an azimuth sensor 19 provided in the vehicle
D, a vehicle speed detection output SV indicating a running speed of the vehicle from a vehicle speed sensor 20 provided in the vehicle, and reference position data DZ indicating a reference position of the vehicle from the navigation operation control unit 21 are supplied.

The map data DM stored in the map data storage memory unit 22 forming the map data providing unit in which map data relating to the road map network within the moving range of the vehicle is also supplied to the current position detecting unit 18. You.
Then, the current position detection unit 18 takes an operation state according to the control signal CPP supplied from the navigation operation control unit 21. The reading of the map data DM from the map data storage memory unit 22 is performed according to a memory control signal CMP supplied from the navigation operation control unit 21 to the map data storage memory unit 22.

The current position detecting section 18 operates under the operation state according to the control signal CPP.
Signal SG from the vehicle, azimuth detection output SD from the azimuth sensor 19, vehicle speed detection output SV from the vehicle speed sensor 20, and reference position data D from the navigation operation control unit 21
Based on Z and the map data DM from the map data storage memory unit 22, the current position of the vehicle is detected as a position on the road map represented by the map data DM, and the current position data DP representing the detected current position is detected. Send out. Then, the current position data D obtained from the current position detection unit 18
P is supplied to the traveling route setting unit 24, the display data forming unit 25, and the navigation operation control unit 21.

The travel route setting section 24 includes, in addition to the current position data DP, map data DM from the map data storage memory section 22 and information data from the navigation operation control section 21 indicating a destination point to be reached by the vehicle. Certain destination data DT is also supplied. The traveling route setting unit 24 includes:
Current position data D when destination data DT is supplied
The position represented by P, that is, the position of the vehicle represented by the reference position data DZ when the destination data DT is supplied to the traveling route setting unit 24, is set as the traveling start point on the road map represented by the map data DM, Destination data DT
The position on the road map represented by the map data DM corresponding to the destination represented by is set as the destination point, and the route from the traveling start point to the destination point on the road map represented by the map data DM is set as the route that the vehicle should travel. I do.
Then, the traveling route setting unit 24 sends the setting route data DCS representing the set route to the display data forming unit 25.

The display data forming unit 25 includes the current position data DP from the current position detecting unit 18 and the traveling route setting unit 24.
, The map data DM from the map data storage memory unit 22, the menu data DMN and the pointer data DPO sent from the navigation operation control unit 21 are also supplied.

Under the circumstances, in the display data forming section 25, the current position data DP, the set route data DCS,
Selected ones of the map data DM, the menu data DMN and the pointer data DPO are appropriately combined,
A road map represented by the map data DM, a current position of the vehicle represented by the current position data DP superimposed on the road map, a set route represented by the set route data DCS,
Image display data DSP that comprehensively represents characters, figures, and the like represented by the menu data DMN and pointers represented by the pointer data DPO is formed. Then, the image display data DSP obtained from the display data forming unit 25 is supplied to the detachable display unit 12 via the wiring 13.

The navigation operation control section 21 is connected to a light receiving section 31 and an input operation section 32.
The light receiving unit 31 receives, for example, light (for example, infrared light) emitted when the remote operation control unit 33 performs a manual operation by a user, and receives a remote control command signal S corresponding to the received light.
RC and sends it to the navigation operation control unit 21
To supply. For example, when a user performs a manual operation, the input operation unit 32 sends out an input command signal SIN and supplies it to the navigation operation control unit 21.

Further, the navigation operation control unit 21 is supplied with the current position data DP from the current position detection unit 18 and the map data DM from the map data storage memory unit 22. Then, the navigation operation control unit 21
The remote control command signal SRC supplied from the light receiving unit 31 or the input command signal SIN supplied from the input operation unit 32
Of the reference position data DZ by the built-in reference position data generator and the reference position data DZ
Is transmitted to the current position detector 18 and the destination data DT and the destination data D by the built-in destination data generator.
Transmission of T to the travel route setting unit 24, generation of menu data DMN by the built-in menu data generation unit, transmission of the menu data DMN to the display data formation unit 25, generation of pointer data DPO by the built-in pointer data generation unit And transmission of the pointer data DPO to the display data forming unit 25, and the like. Further, the navigation operation control unit 21 sends out operation control data DCU according to an operation according to the remote control command signal SRC supplied from the light receiving unit 31 or the input command signal SIN supplied from the input operation unit 32, and Operation control data DCU
Is supplied to the detachable display unit 12 through the wiring 13.

The detachable display unit section 12 is provided with a battery section 41 forming an auxiliary battery power supply section. Further, the detachable display unit section 12 includes a display operation control section 42, a display data memory section 43, and a display section 44. The display section 44 includes a video signal forming section 45 and an image display section 46. I have.

The detachable display unit 12
The wiring 13 is connected to the navigation system unit 11.
In a state where the navigation system unit 11 is electrically connected to the navigation system unit 11 through the power supply unit 14, the navigation system unit 11 operates by receiving power supply from a power supply unit 14 forming a main power supply unit provided in the navigation system unit 11. A battery unit 4 forming an auxiliary battery power supply unit in a state where the battery unit 4 is disconnected from the system unit 11 and disconnected from the navigation system unit 11 via the wiring 13;
It operates by receiving power supply from the power supply 1.

In such a detachable display unit 12, the navigation system 11 is connected to the navigation system 11 and
The operation control data DC transmitted from the navigation operation control unit 21 in the navigation system unit 11 and supplied to the detachable display unit unit 12 through the wiring 13 under the state where the electrical connection with the
U is supplied to the display operation control unit 42. Thereby,
The display operation control unit 42 is the navigation operation control unit 21
Operation control signal CCU according to operation control data DCU from
The MR, VCS and CDP are sent out, and are sent to the display data memory unit 43, the video signal forming unit 45 and the image display unit 4.
6 is performed.

The navigation system unit 11 is connected to the navigation system unit 11 and
In the detachable display unit 12 placed in a state of being electrically connected to the power supply, power is supplied from a power supply unit 14 forming a main power supply unit provided in the navigation system unit 11. With this, sent from the display data forming unit 25 in the navigation system unit 11,
The image display data DSP supplied to the detachable display unit 12 through the wiring 13 is stored in the display data memory 43.
Supplied to The display data memory unit 43 stores the image display data DSP from the display data forming unit 25 under the control of the operation control signal CMR from the display operation control unit 42, and stores the stored image display data thereafter. The reading of the DSP is performed. The storage of the image display data DSP from the display data forming unit 25 in the display data memory unit 43 is performed by storing the image display data DSP transmitted from the display data forming unit 25 in the display data memory unit 43.
Are sequentially written to the address position designated by the operation control signal CMR in the above.

The image display data DSP read from the display data memory unit 43 is supplied to a video signal forming unit 45 constituting the display unit 44. In the video signal forming section 45, under the control of the operation control signal CVS from the display operation control section 42, a color video composed of the red primary color signal R, the green primary color signal G and the blue primary color signal B based on the image display data DSP. A signal is formed, and the color video signal is supplied from the video signal forming section 45 to the image display section 46 constituting the display section 44. Thereby, in the image display unit 46, under the control of the operation control signal CDP from the display operation control unit 42, the image display based on the image display data DSP read from the display data memory unit 43 is performed, For example, on the screen of the image display unit 46, a map image representing a road map, an image representing the current position of the vehicle superimposed on the map image, an image representing a set route, and characters and graphics representing various menus are displayed. Further, a display of a pointer image that moves freely in the screen can be obtained.

In the detachable display unit 12 which is separated from the navigation system unit 11 and disconnected from the navigation system unit 11 through the wiring 13, the auxiliary battery Under the control of the operation control signal CMR from the display operation control unit 42 in the display data memory unit 43 under the supply of power from the battery unit 41 forming the power supply unit, the detachable display unit 12 Before the image data is separated from the navigation system unit 11, the image display data DSP read from the display data forming unit 25 stored in the display data memory unit 43 is read. Then, the image display data DSP read from the display data memory unit 43
Are supplied to a video signal forming unit 45 constituting the display unit 44.

In the video signal forming section 45, under the control of the operation control signal CVS from the display operation control section 42, the red primary color signal R, the green primary color signal G and the blue primary color signal B based on the image display data DSP are used. A color video signal is formed, and the color video signal is
5 is supplied to the image display unit 46 constituting the display unit 44. As a result, in the image display section 46, the detachable display unit section 12 read from the display data memory section 43 under the control of the operation control signal CDP from the display operation control section 42 performs navigation and control. System part 1
An image display based on the image display data DSP stored in the display data memory unit 43 is performed before disconnection from the display data memory unit 43.

Therefore, the navigation system unit 11
The detachable display unit unit 12 separated from the display unit 46 is displayed by the image display unit 46 on the image display data DSP stored in the display data memory unit 43 before the detachable display unit unit 12 is separated from the navigation system unit 11.
In a state where the image display based on is performed, the portable device can be freely carried.

FIG. 2 shows an example of a navigation device according to the invention described in claim 2 of the present application. In FIG. 2, parts, signals, and data corresponding to the respective units, signals, and data shown in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and redundant description thereof will be omitted. You. Further, the navigation system unit 11 in FIG. 2 is the same as the navigation system unit 11 shown in FIG. 1, but is omitted in FIG.

In the example shown in FIG. 2,
The detachable display unit 12 includes a display operation control unit 42,
An input operation unit 47 connected to the display operation control unit 42 is provided in addition to the display data memory unit 43 and the display unit 44. The input operation unit 47 supplies an input command signal SID corresponding to the operation to the display operation control unit 42, for example, when operated by a user of the apparatus. Thereby, the detachable display unit 12 in the example shown in FIG.
It is assumed that the user can perform an operation control operation through the input operation unit 47 even when the user is in a state of being carried away from the device 1, and performs various operations according to the operation of the input operation unit 47.

FIG. 3 shows an example of the navigation device according to the invention described in claim 3 of the present application. Also in FIG. 3, the portions, signals and data corresponding to the respective portions, the respective signals and the respective data shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. Are omitted. The navigation system unit 11 in FIG. 3 is the same as the navigation system unit 11 shown in FIG. 1, but is abbreviated in FIG.

In the example shown in FIG. 3,
The detachable display unit 12 includes a display operation control unit 42,
Display data memory unit 43, display unit 44, and input operation unit 4
7 and a data communication unit provided in the display operation control unit 42 in a built-in manner. The data communication unit is connected to the navigation operation control unit 21 in the navigation system unit 11 through the wiring 13 when the detachable display unit unit 12 is connected to the navigation system unit 11. As described above, since the display operation control unit 42 includes the data communication unit, the detachable display unit 12 in the example shown in FIG. Can communicate various data DTA with the navigation operation control unit 21 in the navigation system unit 11, and can perform not only an image display based on the image display data DSP but also various other functions. Is done.

FIG. 4 shows an example of a navigation device according to the invention described in claim 4 of the present application. Also in FIG. 4, parts, signals and data corresponding to the respective parts, signals and data shown in FIGS. 1 and 3 are denoted by the same reference numerals as those in FIG. 1 and FIG. Are omitted. Further, the navigation system unit 11 in FIG. 4 is the same as the navigation system unit 11 shown in FIG. 1, but is abbreviated in FIG.

In the example shown in FIG. 4,
The detachable display unit 12 includes a display operation control unit 42,
Display data memory unit 43, display unit 44, input operation unit 47
In addition to the above, an information transmitting / receiving unit 48 connected to the display operation control unit 42 is provided. Information transmitting / receiving unit 48
Is provided with a transmitting / receiving antenna 49, and performs a wireless telephone function, for example. Thereby, the detachable display unit 12 in the example shown in FIG. 4 can be either in a state of being connected to the navigation system unit 11 or in a state of being separated from the navigation system unit 11 and carried. Even if there is, the information data DTR between the display operation control unit 42 and the information transmitting / receiving unit 48
To receive information from the outside and transmit information to the outside through the information transmitting / receiving unit 48 and the transmitting / receiving antenna 49. In addition to the image display based on the image display data DSP, various other It can fulfill various functions.

[0042]

As is apparent from the above description, in the navigation device according to any one of the first to sixth aspects of the present invention, image display data is represented. A portion including a display unit for displaying navigation information in an image, in addition to the display unit, a memory unit for storing image display data from a display data forming unit in the navigation system unit, and a display for controlling the memory unit and the display unit An operation control unit, and
Since it is a detachable display unit that is detachably disposed with respect to the navigation system unit, the display unit includes an auxiliary battery power unit, and includes a display unit that displays navigation information represented by image display data. ,
The detachable display unit can be detached from the navigation system, and can be carried as a state in which power is supplied from the auxiliary battery power supply and an image is displayed on the display based on image display data. Become.

In the navigation apparatus according to the second, third or fourth aspect of the present invention, the detachable display unit includes a display operation control unit. A data communication unit provided in the display operation control unit, and a navigation system unit provided with the data communication unit, the operation system being capable of performing operation control operations through the input operation unit. The image display data is represented by a device capable of performing data communication with the navigation operation control unit or a device including an information transmitting and receiving unit for receiving information from outside and transmitting information to outside. A detachable display unit, which includes a display unit for displaying navigation information as an image, is based on image display data from the display unit. In addition to displaying the image, as being capable of fulfilling also other various functions, it will be able to carry.

Therefore, according to the navigation device according to any one of the first to sixth aspects of the present invention, for example, a user of the navigation device visits a specific building. In the case, the user refers to the navigation information provided as an image by the image display unit of the navigation device, goes by car to a parking lot near a specific building, and then leaves the vehicle in the parking lot. In a situation where a user arrives at a specific building, the user who caused the vehicle to reach the parking lot is ignorant of the route from the parking lot to the specific building, or the route is relatively complicated from the parking lot to the specific building. The user must carry the detachable display unit separately from the navigation system, even if More, for example, must Oboekoma map information of the last frame displayed image on the display unit, or can avoid a situation where must write down the appropriate paper etc., it is released from troublesome.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a navigation apparatus according to any one of claims 1, 5 and 6 of the present application.

FIG. 2 is a block diagram showing an example of a navigation device according to the invention described in claim 2 of the present application.

FIG. 3 is a block diagram showing an example of a navigation device according to the invention described in claim 3 of the present application.

FIG. 4 is a block diagram showing an example of a navigation device according to the invention described in claim 4 of the present application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Navigation system part 12 Removable display unit part 13 Wiring 14 Power supply part 15 Position detection part 16 GPS signal antenna 17 GPS
Signal receiving unit 18 Current position detecting unit 19 Direction sensor 20 Vehicle speed sensor 21
Navigation operation control unit 22 Map data storage memory unit 24 Travel route setting unit 25 Display data forming unit 31 Light receiving unit 32, 47 Input operation unit 33 Remote operation control unit 41 Battery unit 42 Display operation control unit 43 Display data memory unit 44 Display unit 4
5 Video signal forming unit 46 Image display unit 48 Information transmitting / receiving unit 49
Transmitting and receiving antenna

Claims (6)

[Claims] 1. A position detecting section for detecting a current position of a vehicle and transmitting current position data, a map data providing section for transmitting map data representing a map, a current position data from the position detecting section, and a provision of the map data. Display data forming section for obtaining image display data representing navigation information based on map data from the section, a navigation operation control section for controlling the position detecting section, the map data providing section and the display data forming section, and a main power supply section A navigation system unit comprising: a memory unit arranged detachably with respect to the navigation system unit for storing image display data from the display data forming unit; and image display data read from the memory unit. A display unit for displaying the navigation information as an image, and control over the memory means and the display unit. A navigation device comprising: a display operation control unit for controlling the display; and a detachable display unit including an auxiliary battery power supply. 2. The navigation device according to claim 1, wherein the detachable display unit has an input operation unit connected to the display operation control unit, and can perform an operation control operation through the input operation unit. 3. A detachable display unit includes a data communication unit provided in a display operation control unit, and the data communication unit can perform data communication with a navigation operation control unit in a navigation system unit. The navigation device according to claim 1 or 2, wherein: 4. The navigation device according to claim 1, wherein the detachable display unit includes an information transmitting / receiving unit for receiving information from outside and transmitting information to outside. 5. A display in the detachable display unit, wherein a video signal forming section for obtaining a video signal based on image display data read from the memory means, and an image display based on the video signal from the video signal forming section. The navigation device according to claim 1, further comprising an image display unit. 6. When the detachable display unit is attached to the navigation system, the detachable display unit is operated by receiving power from a main power supply in the navigation system, and is detached from the navigation system. The navigation device according to any one of claims 1 to 5, wherein the navigation device operates by receiving power supply from an auxiliary battery power supply unit when the navigation device is operated.