Navigation apparatus for automobile
First Claim
1. A navigation apparatus including:
- distance-traveled detection means for detecting the distance traveled by a vehicle;
direction detection means for detecting the direction of travel of said vehicle;
data memory means for holding map data;
signal calculation processing means for calculating the present position of said vehicle from signals received from said distance-traveled detection means and said direction detection means, and for outputting display signals for said present position and display signals for map data read out from said data memory means corresponding to a map area including said present position; and
display means for displaying said display signals;
said signal calculation processing means including means for updating said map data to a different map area according to the movement of the vehicle as indicated by the calculated present position of the vehicle when the position of the vehicle is heading into said different map area, and means for initiating operation of said updating means when the present position of the vehicle reaches a point which is spaced from the boundary of said map area by an amount determined by the speed of said vehicle.
1 Assignment
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Accused Products
Abstract
In a navigation apparatus for automobile having a distance-travel detection sensor for detecting the distance traveled by a vehicle a direction detection sensor for detecting the direction of travel of the vehicle, data memory for holding map data and etc., a micro processing unit for calculating the present position of the vehicle from the signals of the distance-traveled detection sensor and the direction detection sensor and for outputting display signals for the present position of the vehicle and display signals for map data read out from the data memory to correspond to the present position of the vehicle and display means for display the display signals thereon, wherein the point, at which an update of the map data corresponding to the movement of the vehicle starts, is variable in accordance with the speed of the vehicle.
21 Citations
4 Claims
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1. A navigation apparatus including:
- distance-traveled detection means for detecting the distance traveled by a vehicle;
direction detection means for detecting the direction of travel of said vehicle;
data memory means for holding map data;
signal calculation processing means for calculating the present position of said vehicle from signals received from said distance-traveled detection means and said direction detection means, and for outputting display signals for said present position and display signals for map data read out from said data memory means corresponding to a map area including said present position; and
display means for displaying said display signals;
said signal calculation processing means including means for updating said map data to a different map area according to the movement of the vehicle as indicated by the calculated present position of the vehicle when the position of the vehicle is heading into said different map area, and means for initiating operation of said updating means when the present position of the vehicle reaches a point which is spaced from the boundary of said map area by an amount determined by the speed of said vehicle. - View Dependent Claims (2, 3, 4)
- distance-traveled detection means for detecting the distance traveled by a vehicle;
Specification