An integrated position and direction system is disclosed that includes a digital compass, wherein the digital compass includes at least three sensors, and a satellite positioning system having a receiver adapted to receive satellite position determining signals. Direction is determined using the digital...http://www.google.fr/patents/US6353798?utm_source=gb-gplus-shareBrevet US6353798 - Integrated position and direction system with three-sensor digital compass
Integrated position and direction system with three-sensor digital compass
