. . "ng oscillatorUS489023327 Oct 198726 Dic 1989Pioneer Electronic CorporationVehicle bearing detection and data processing methods applicable to vehicle navigation systemUS489466214 Abr 198616 Ene 1990Western Atlas International, Inc.Method and system for determining position on a moving platform, such as a ship, using signals from GPS satellitesUS499811127 Nov 19895 Mar 1991Motorola, Inc.CPS transfo" . .