GG-Tracker GPS and GSM Tracking
GG-Tracker tracks your mobile using GSM Cell-location in combination with GPS. It uses both GPS and GSM networks to get a position. If only GSM is available it relies on location previously stored using a GPS receiver. The position is displayed on the internet using a Google Maps integration. The operation is very simular to how Google Maps 'My location' works, only this time you are in control. If a GPS receiver is connected it does two things, it stores the current position and the GSM cell the phone is connected to. If the GPS is not connected anymore it checks the database for previously known coordinates of the GSM cells. When it was connected to GPS the program stored the GSM cells, so all it does, is look back and see if there is a proper fit. If it finds a fit, it reports that as a position, meaning that GPS is not necessary anymore for positioning.