XV
GLOSSARY
This section explains common maritime terms and the terms used for this equipment.
ARPA (Automatic Radar Plotting Aid) : Supporting equipment for automatically preventing clash.
ATA (Automatic Tracking Aid) : Supporting equipment for automatically preventing clash.
Fast Time Constant (FTC) : Rain and snow clutter suppression.
Sensitivity Time Control (STC) : Sea surface clutter suppression.
Bearing : Direction
COG : Course over Ground
CPA/TCPA : Closest point of approach and time to closest point of approach
limit as defined by the observer to give warning when a tracked
target or targets will close to within these limits from own
ship
CUP (Course-UP) : An azimuth stabilized display in which a line connecting the
centre of own ship with the top of the display is own ship's
intended course
EBL (Electric Bearing Line) : Electric bearing line centering the position of the own ship.
GPS (Global Positioning System) : Internationally-used positioning system.
Ground stabilization : A mode of display whereby own ship and all targets are
referenced to the ground using ground track or set and drift
inputs
Guard zone : A zone in which an alarm is given when a target is detected
Heading : The direction in which the bows of a ship are pointing
expressed as an angular displacement from north
HL : Heading Line
HUP (Head-UP) : Display mode in which the top of the screen corresponds to
the ship's head maker.
IMO : International Maritime Organization
IR : Interference Rejector
NM : Nautical Mile (1 nm = 1,852 m)
NSK : Gyro compass and log interface
NUP (North-UP) : An azimuth stabilized display in which a line connecting the
centre of own ship with the top of the display is north true
bearing
Own track : Automatic track display function.
Range ring : Fixed range ring.
RM (Relative Motion) : The combination of relative course and relative speed
RM display : A display on which the position of own ship remains fixed
and all targets move relative to own ship
Relative bearing : The direction of a target from own ship expressed as an angular
displacement from own ship's heading
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