Originally Posted by
HooKooDooKu
The simple explanation of how GPS works is that GPS satellites constantly send out a signal indicating where it is and what time it is. Since each satellite is a different distance from your GSP receiver, the time stamps on these signals will be out of sync. Once the GPS has locked in on at least three satellite signals, it becomes a complex triangulation calculation of the difference in these time stamps and the locations of the satellites to determine where you are.