Glossary
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L
LAN Local Area Network
LGPL Lesser General Public License
LW Long Wave
M
MSAS Multi-functional Satellite Augmentation System. It supports
differential GPS to supplement the GPS system by reporting on the
reliability and accuracy of those signals.
MSK Minimum Shift Keying
MSS NMEA sentence for status information of beacon receivers
N
NMEA National Marine Electronics Association (standard). A combined
electrical and data specification for communication between marine
electronic devices such as echo sounder, sonars, anemometer (wind
speed and direction), gyrocompass, autopilot, GPS receivers and many
other types of instruments. It has been defined by, and is controlled
by, the U.S.-based National Marine Electronics Association.
R
RTCM Radio Technical Commission for Maritime Services
S
SBAS Satellite Based Augmentation System
SDCM System for Differential Corrections and Monitoring, a component of
GLONASS.
SNR Signal to Noise Ratio
T
TPI Threads Per Inch
W
WAAS Wide Area Augmentation System, a navigation aid to improve
accuracy and integrity of the GPS signal.
WER Word Error Rate
WGS World Geodetic System
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