By combining data from four satellites at once, a GPS receiver can pinpoint its position on the globe through a process called trilateration. Here’s how it works.

It’s not a foolproof system: Cybercriminals use a tactic called GPS spoofing, which sends inaccurate data to GPS receivers in order to redirect or disrupt a navigation system.

Does anyone know of the maximum elevation a GPS receiver can generally be used (need longitude, latitude and height data )? Basically I want to use a GPS in an amateur satellite, for establishing ...