Navigation system

A navigation system detects a present position of a movable body and performs a navigation for the movable body on the basis of map information. The navigation system is provided with: a storage device (15) of non-volatile type capable of writing the map data thereinto and reading the map data there...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KANEKO MICHIHIRO, NAGAKI KOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING ANALOGOUS ARRANGEMENTS USING OTHER WAVES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE CALCULATING COMPUTING COUNTING CRYPTOGRAPHY DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES DIAGRAMS DISPLAY EDUCATION EDUCATIONAL OR DEMONSTRATION APPLIANCES ELECTRIC DIGITAL DATA PROCESSING GLOBES GYROSCOPIC INSTRUMENTS LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS NAVIGATION PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS PLANETARIA RADIO DIRECTION-FINDING RADIO NAVIGATION SEALS SIGNALLING SURVEYING TESTING TRAFFIC CONTROL SYSTEMS
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Beschreibung
Zusammenfassung:	A navigation system detects a present position of a movable body and performs a navigation for the movable body on the basis of map information. The navigation system is provided with: a storage device (15) of non-volatile type capable of writing the map data thereinto and reading the map data therefrom; a map data transferring device (11) for obtaining the map data corresponding to a predetermined area, and transferring and storing the map data corresponding to the predetermined area to the storage device; an empty area judging device (11) for judging whether or not an empty storage area having a predetermined capacity is reserved in the storage device when the map data transferring device is to transfer the map data corresponding to the predetermined area to the storage device; and an erasing device (11) for determining unnecessary data among data stored in the storage device on the basis of a predetermined condition, and erasing the unnecessary data from the storage device if the empty area judging device judges that the empty storage area is not reserved.