Map acquisition system, map acquisition unit, and navigation app

Details Map acquisition system, map acquisition unit, and navigation app Map acquisition system, map acquisition unit, and navigation app

1998-07-14

2000-05-09

Swarthout, Brent

Communications: electrical

Vehicle position indication

Map display

340990, 701208, 701212, G08G 1123

Patent

active

060610034

ABSTRACT:
A vehicle-mounted map acquisition apparatus 1 obtains maps A-D of different scales from a information center 30. Map A with a small scale covering a wide area is obtained at a starting point distant from a destination and is used to provide route guidance. As a vehicle approaches the destination, it reaches a map acquisition point where map B with a larger scale is obtained. As the vehicle further approaches the destination, a map with a still larger scale is obtained. Map data with a scale suitable for each place along the way to the destination is obtained. As a large amount of data is not sent at once, sufficient map data can be obtained with a limited communication capability and a small capacity memory.

REFERENCES:
patent: 4675676 (1987-06-01), Takanabe et al.
patent: 4819174 (1989-04-01), Furuno et al.
patent: 5315298 (1994-05-01), Morita
patent: 5471205 (1995-11-01), Izawa
patent: 5543789 (1996-08-01), Behr et al.
patent: 5680312 (1997-10-01), Oshizawa et al.
patent: 5850618 (1998-12-01), Suetsugu et al.

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