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Glossary
Leica GS20 Field Guide-1.1.0en
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RTCM
Radio Technicial Comission for Maritime services.
Commission set up to define differential data link to relay
GPS messages from a monitor station to a field user.
Selective Availability
Degradation of GPS point positioning accuracy for civilian
users by the U.S. Department of Defense. SA is produced
by clock dithering or orbit degradation.
Signal to Noise Ratio
A ratio of the radio frequency signal strength and the
noise floor.
Time and Initial Position
The time and position value a GPS receiver will use with
an almanac to more quickly locate satellites.
WAAS
The Wide Area Augmentation System, or WAAS is a free
real-time correction for GPS available in North America,
and is compatible with the European EGNOS correction,
currently in a testing phase. Because this correction is
broadcast on the same frequency as GPS, it can be
received without the need for additional hardware, and
free of charge.
Waypoints
A point, or node on a line or area flagged for navigation.