SOG
Speed Over the Ground
The speed of the ship relative to the earth, measured on board of the
ship.
SP
Short Pulse
STAB
STABilization
STW
Speed Through Water
The speed of the ship relative to the water surface.
T
TCPA
Time to Closest Point of Approach to own ship
Test target
Radar target of known characteristics used for test requirement
TM
True Motion
A display across which own ship moves with its own true motion.
Trails
Tracks displayed by the radar echoes of targets in the form of an
afterglow.
Trial maneuver
A graphical simulation facility used to assist the operator to perform a
proposed maneuver for navigation and collision avoidance purposes.
True course
The direction of motion relative to ground or to sea, of a target
expressed as an angular displacement from north
True speed
The speed of a target relative to ground, or to sea
True vector
A vector representing the predicted true motion of a target, showing
course and speed with reference to the ground or sea
TT
Target Tracking.
A computer process of observing the sequential changes in the
position of a radar target in order to establish its motion. Such a
target is a Tracked Target.
TTG
Time To Go.
Time to next waypoint.
TXRX
Transceiver Unit
U
UTC
Universal Time Coordinated.
The international standard of time, kept by atomic clocks around the
world.
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