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GPS Glossary

GPS - Global Positioning System, a satellite based navigational aid available to the public

GPS receiver - a device that can lock on to signals from navigational satellites and use them to provide location, altitude and velocity to the user

Navigation device - Satellite Navigation device, a type of GPS receiver used for routing and mapping

Touch screen - the LCD display on Navigation device devices that responds to fingertip pressure to change settings

GPS time - the standardized time to which GPS satellites are synchronized, it is not tied to the rotation of the earth so there are no "leap seconds" in GPS time

GPS constellation - the group of approximately 30 GPS satellites orbiting the earth that broadcast microwave signal to be received by GPS receivers

Oscillator - an electronic circuit built into a GPS receiver that provides timing for the microwave signals from the satellites

Microwave signal - a high-energy radio signal that carries a burst of data from the GPS satellites at the speed of light to receivers on earth

Nanosecond - one billionth of a second

Geocaching( aka GPS treasure hunt) - an outdoor game for the digital age in which someone "hides" the treasure or "geocache" and the gamers, "geocachers" use their GPS receiver to try to find it

POIs - Points of interest, restaurants, gas stations, emergency assistance, hotels and more, often embedded in the Navigation device mapping software

Traffic Pack - optional add-on for Navigation devices that taps into traffic news and provides incident alerts and optionally gives you a new route

MP3 player - audio compression format offered in some navigation devices that allows users to listen to music, audio books and podcasts on the go