PDA devices, systems, functional data and methods are provided for biasing an active location to an acceptable location within a planned route of a map. A PDA with map biasing capabilities includes a processor communicating with a memory. In biasing a map, an active position and a planned position are...http://www.google.de/patents/US6856898?utm_source=gb-gplus-sharePatent US6856898 - PDA systems, functional data, and methods to bias map matching
