On-vehicle navigation apparatus

Details On-vehicle navigation apparatus On-vehicle navigation apparatus

1993-03-15

1993-11-16

Crosland, Donnie L.

Communications: electrical

Vehicle position indication

340990, 340995, 364443, 364444, 364449, 36442402, G08G 1123, G01C 2100

Patent

active

052627748

ABSTRACT:
An on-vehicle navigation apparatus has enhanced efficiency of the use of a memory for storing the locus data, without losing the details and accuracy of a locus pattern drawn on the basis of collected locus data. The on-vehicle navigation apparatus acquires vehicle location information C and time information T, and stores the vehicle location information C as locus data Si and the associated time information T as collecting time data Ti in response to a collection command. The apparatus then computes a travel distance D from the previous locus data collecting position on the basis of the vehicle location information C and the locus data Si, computes elapsed time .DELTA.T from the previous locus data collecting time on the basis of the time information T and the collecting time data Ti, and generates the collection command when the elapsed time .DELTA.T reaches a predetermined time after a predetermined travel distance D is reached.

REFERENCES:
patent: 4891760 (1990-01-01), Kashiwazaki et al.
patent: 4903211 (1990-02-01), Ando
patent: 5117363 (1992-05-01), Akiyama et al.

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