JRC JMA-3400 Series, Instruction Manual, Page: 47 / 314

GLOSSARY
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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.
sm Statute mile 1sm=1609.344m
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
STC Sensitivity Time Control
Function of STC reduces the impact of returns from sea state of relatively near from own ship.
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 Display Radar Trails (Other Ships' Trails).
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
USB Universal Serial Bus
USB was designed to standardize the connection of computer peripherals.
UTC
Universal Time Coordinated
The international standard of time, kept by atomic clocks around the world.
V
VRM Variable Range Marker
An adjustable range ring used to measure the distance to a target.
W
Waypoint A geographical location on a route indicating an event.