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Relative bearing .............. The direction of a target from own ship expressed as
an angular displacement from own ship’s heading.
Relative course ................ The direction of motion of a target relative to own
ship’s position expressed as an angular displacement
from north. It is deduced from a number of
measurements of target range and bearing on own
ship’s radar.
Relative speed ................. The speed of a target relative to own ship’s position. It
is deduced from a number of measurements of target
range and bearing on own ship’s radar.
Route plan ...................... A plan that registers plural waypoints in a navigational
path.
Scan CORR .................... Scan Correlation, a method of target processing
enhancement using multiple scan information.
Scanner ........................... Antenna unit.
Sea stabilization .............. A mode of display whereby own ship and all targets
are referenced to the sea, using gyro heading and water
speed inputs.
Sensitivity ....................... The ability of a receiver to pick up small targets.
SOG ............................... Speed over Ground.
Starboard ........................ Right (nautical term)
Stern ............................... The rear of a vessel (nautical term).
TM(True Motion) .......... The combination of true course and true speed.
TM display ..................... A display across which own ship and each target
moves with its own true motion.
Stationary targets such as land do not move except
occasionaly when the picture display shifts position to
keep own ship on the screen.
Trails ............................... Tracks left behind radar targets showing the history of
previous target positions.
Tr ue bearing .................... The direction of a target from own ship or from
another target expressed as an angular displacement
from True North.
Tr ue course ..................... The true direction of motion of a target expressed as
angular displacement form north. It is obtained by a
vector combination of target relative motion and own
ship’s true motion.
Tr ue speed....................... The speed of a target obtained by a vector combina-
tion of target relative motion and own ship’s true
motion.
Tr ue vector ...................... The predicted true motion of a target as result of own
ship’s direction and speed input. The true vector may
be either displayed with reference to the water or to
the ground.
WAAS(Wide Area Augmentation System)
....................................... WAAS is a system that improve GPS position fixing
accuracy.
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