Explaining The Terms - Eclipse AVN2454 Owner's Manual

For reference

3. Explaining the terms

In order to use this device effectively, please keep the following definitions in mind.
GPS(Global Positioning System
Independent navigation
This technology uses data from a vehicle speed sensor and vibration gyro sensor to track
the path followed by your vehicle in order to pinpoint your present location.
The present location of your vehicle can be pinpointed even in tunnels and under elevated
roads.
Positioning
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The GPS is a system that uses signals received
from a satellite in a maximum orbit of approximately
21,000km above the earth to indicate your present
position (latitude, longitude, altitude). These
satellites were launched into space by the U.S.
Department of Defense to be used for military
purposes. This system was released for public
utility.
Signals are received from 3 or more GPS
satellites to pinpoint the present location of
your vehicle. The device will display a
mark on the upper left part of the
present location screen when it is receiving
signals from 3 or more satellites and
positioning is rendered possible. (The
mark is not displayed on the
setting or registration screens.)