A query is formatted at the remote unit, the query including the request, and is transmitted from the remote unit to the base...http://www.google.co.uk/patents/US6614363?utm_source=gb-gplus-sharePatent US6614363 - Electronic navigation system and methodAdvanced Patent SearchPublication numberUS6614363 B1Publication typeGrantApplication numberUS 09/572,877Publication date2 Sep 2003Filing date18 May