Audiovox VM9725BT Operations Instructions download pdf (Page 13)

VM9725BT

About GPS and GNSS

The unit uses a vehicle Global Positioning System (GPS)-based navigation device

which uses digital map data to guide you from your selected location A to

location B, using location information obtained from a Global Navigation Satellite

System (GNSS).

A GNSS consists of a set of satellites that transmit high-frequency radio signals

containing time, direction, and distance data that can be picked up by a receiver,

allowing users to pinpoint their precise locations anywhere around the globe.

Navigation Satellite Receivers (GPS devices) use this transmitted information to

calculate an exact location on the Earth. Every point on Earth can be identied

by latitude and longitude. The receiver uses the information sent by at least three

satellites and determines the coordinates of the receiving device.

By comparing the time the signals were transmitted from the satellites and the

time they were recorded, the receiver calculates how far away each satellite is.

The distance of the receiver from three or more satellites reects its position

on the surface of the planet. Using these distance measurements, the receiver

might also be able to calculate speed, bearing, trip time, distance to destination,

altitude, etc. The GPS position may be displayed as a point on a digital map (at

least three satellites’ signals must be received) and as the GPS device moves the

corresponding trace is displayed as well.

Please keep in mind that although the radio signals of navigation satellites will

pass through clouds, glass, plastic, and other lightweight materials, satellite-

navigation receivers will not work underground or in some enclosed spaces.

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Audiovox VM9725BT Operations Instructions Page 13