Systems and methods are provided for complementary navigation devices with various integrated positioning functionality. The navigation method includes providing a first navigation device. The first navigation device includes a triangulation positioning functionality. The method includes providing a...http://www.google.fr/patents/US7483789?utm_source=gb-gplus-shareBrevet US7483789 - Systems and methods with integrated triangulation positioning and dead reckoning capabilities
Systems and methods with integrated triangulation positioning and dead ...