51User Manual
7 The Global Positioning System
The Global Positioning System (GPS) is a constellation of satellites that orbit
the earth twice a day, transmitting precise time and positioning information to
anywhere on the globe, 24 hours a day.
The system was designed and deployed by the U.S. Department of Defense to
provide continuous, worldwide positioning and navigation data to U.S. and
allied military forces. GPS broad commercial applications were recognized early
in the system’s development, and the U.S. government decided to allow free
access to GPS signals. Today, GPS is used in a wide variety of commercial and
scientific applications.
7.1 GPS PAGE
The GPS page shows GPS data in graphic mode, displaying satellite availabil-
ity and status.
> ‘MENU’ 1 sec. + “GPS PAGE” + ‘ENTER’
Fig. 7.1 - The GPS page
This page displays the current status and location of all available satellites in
the GPS constellation, referenced to the initial position or last fix.
On the bottom half of the screen (see previous figure) there is a polar representa-
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