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RM(R) Relative Motion. Relative Trails.
RM(T) Relative Motion. True Trails.
ROT Rate Of Turn
Change of heading per time unit.
Route A set of waypoints.
RR Range Rings
S
Sea stabilization A display mode in which speed and course information are referred
to the sea.
Sea state Status of the sea condition due to the weather environment,
expressed as a sea state 0 for flat conditions with minimal wind, to
sea state 8 for very rough sea conditions.
SET The current direction for manual correction or the current speed on
the horizontal axis of the 2-axis log is displayed.
Sleeping AIS
target
A target indicating the presence and orientation of a vessel
equipped with AIS in a certain location.
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 manoeuvre 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
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