A method is provided for improved navigation guidance in a portable navigation device (104) having a first navigation operating mode (302) for requesting (318, 324) and receiving (326, 334) routelet data and navigation route data and operating in accordance with the routelet data (332) and a second operation...http://www.google.de/patents/US7418339?utm_source=gb-gplus-sharePatent US7418339 - Method for initiating navigation guidance in a distributed communications system
