Glossary
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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.
P
PI Presentation Interface
R
RAIM Receiver Autonomous Integrity Monitoring. Integrity check of the
position.
RF Radio Frequency
ROT Rate Of Turn
S
SART Search And Rescue Transponder
SOG Speed Over Ground.
SOLAS (International Convention for the) Safety Of Life At Sea. Generally
regarded as the most important of all international treaties
concerning the safety of merchant ships.
SRM Safety Related Messages
T
TDMA Time-Division Multiple Access
TPI Threads Per Inch
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.
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