4IGO primo software provides turn-by-turn visual and voice assistance to direct youto your selected destination. The software quickly calculates step-by-step direc-tions to any destination available on the included navigation map.The IGO primo software uses Global Positioning System (GPS) satellites, and adigital roadway map database to calculate and display travel directions. The sys-tem’s GPS antenna receives signals from a constellation of 24 satellites orbiting theearth and uses the strongest signals to determine your position to within meters.Vehicle PositionThe IGO primo software’s computer considers vehicle speed and heading changes,together with longitude and latitude information, to accurately determine vehicleheading and position on a digital map.Signals from GPS satellites are used to determine the vehicle location. Three(good) or four (best) satellites must be received to accurately determine location.The GPS reception status is indicated by the GPS symbol on the map.Map and Information DatabaseThe map database used by your IGO primo software was created usinghigh-resolution aerial and land based data collection.Car navigation maps are frequently updated. While the database was judged tobe as accurate as possible at the time of its release, a map database can never be100% accurate. Road information that is maintained in the map databases, such asturn restrictions or road names may change over time.
