One of the more interesting facets of GPS is that, at least from the receiver’s point-of-view, it’s a fairly passive system. All of the information beamed down from the satellites is out in ...

A safety net of balloon-mounted sensors listening for satellites and cell towers could save lives if an airplane's GPS ...

The 31 operating GPS satellites orbit Earth twice daily, emitting precise signals that receivers on the ground can pick up ... cell towers in relation to a plane. It then uses this information ...