04546551 is referenced by 375 patents and cites 17 patents.

The system of the present invention provides an electrical digital compass for use in a vehicle which includes a unique compensation and variation correction control which is readily set by the vehicle operator with the operation of push-button switches. The electrical display system and circuitry includes a microprocessor for comparing the information from a magnetic field sensor when the vehicle is aligned in a magnetically known direction and for providing a correction signal to assure the displayed output corresponds to the predetermined magnetic field alignment. In areas where magnetic variation is significant, the system generates, stores and processes a correction signal to assure the displayed output corresponds to the true heading of the vehicle. In one embodiment of the invention, a temperature sensor is provided to indicate the ambient temperature in which the vehicle is operating and which is digitally displayed to the operator.

Title
Electrical control system
Application Number
6/478364
Publication Number
4546551
Application Date
March 24, 1983
Publication Date
October 15, 1985
Inventor
Jeffrey L Franks
Houston
TX, US
Agent
Price Heneveld Huizenga & Cooper
Assignee
Prince Corporation
MI, US
IPC
G01C 17/28
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