Glossary
74
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.
V
VDL VHF Data Link
VHF Very High Frequency. 30-300 MHz, a "straight-line" signal used
for short-distance terrestrial communication and navigation.
VSWR Antenna Voltage Standing Wave Ratio
VTS Vessel Traffic Service, a marine traffic monitoring system
established by harbour or port authorities, similar to air traffic
control for aircraft.
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