Modular, touch screen friendly navigation system with GPS tracking, realtime routing engine and support for various vector map formats. Works on a wide range of devices, from computers to smartphones.
RouteConverter is another route conversion tool. It helps me and I hope it could help you.
gps chung is an open source GPS algorythm program. It calculates the shortest way path from start to end out of an array of road segments (position, direction) . Source code gps_chung.bi is included as example in a small application game garden_chung (freebasic) lite version of circuit_chung road circuit game with random map generation , home garden edit and gps speech voices.