Vehicle compass correction circuit

摘要

A compass circuit has a magnetic field sensor adapted to be positioned in a vehicle near a source of varying magnetic fields. A source of correction signals is coupled to the compass circuit for providing correction signals applied to the compass circuit for correcting the heading display of the compass circuit when differing levels of magnetic field disturbance occurs to provide accurate heading information. In a preferred embodiment the source of correction signals includes a detector circuit coupled to the vehicle accessory for providing signals directly corresponding to the source of magnetic field interference.