Yep: "Radio waves are electromagnetic energy, which means they travel at the speed of light (about 186,000 miles per second, 300,000 km per second in a vacuum).

Yep: "Radio waves are electromagnetic energy, which means they travel at the speed of light (about 186,000 miles per second, 300,000 km per second in a vacuum). The receiver can figure out how far the signal has traveled by timing how long it took the signal to arrive." - http://electronics.howstuffworks.com/gadgets/travel/gps2.htm http://electronics.howstuffworks.com/gadgets/travel/gps2.htm