... -4 Model Number: D-1800Size: 3.5'' GPS Navigation, Car GPS, GPS Navigator, Portable GPS- 3.5" Digital screen, 64K color with ... 90% / 10 meter - Sensitivity: 0.1 m/s - Localization time: 0.1 s FUNCTIONS:1. Voice navigation: route planning, voice ... searches, history record, visual angle choice, current surrounding search, settings.3. Information of car speed, direction, distance, star picture, longitude ...