Glossary
34
LORAN LOng RAnge Navigation, a terrestrial radio navigation system
which enables ships and aircraft to determine their position and
speed from low frequency radio signals transmitted by fixed
land based radio beacons.
N
NAVDAT High Speed NAVtex DATa sent out on 500 kHz. Not yet part of
mandatory Navtex reception, but mentioned in ITU-R M.2010
and ITU-R M.2201.
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.
S
SAR Search And Rescue
U
UTC Universal Time, Coordinated. The International Atomic Time
(TAI) with leap seconds added at irregular intervals to
compensate for the Earth’s slowing rotation. Leap seconds are
used to allow UTC to closely track UT1, which is mean solar
time at the Royal Observatory, Greenwich.
98-137261.book Page 34 Wednesday, February 19, 2014 2:06 PM
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