F
fm fathom 1fm=1.8288m
FTC Fast Time Constant
Function of FTC reduces the effect of long duration returns that come from rain or snow.
G
GPS Global Positioning System
GPS is a space-based satellite navigation system that provides location and time
information in all weather conditions.
Ground stabilization A display mode in which speed and course information are referred to the ground, using
ground track input data.
Gyrocompass A gyrocompass is non-magnetic compass which is based on a fast spinning disc and
rotation of the Earth to automatically find north and south direction.
H
HDG Heading
The horizontal direction that the bow of a ship is pointing at any instant, expressed in angular
units from a reference direction.
HDOP Horizontal Dilution of Precision
The accuracy of the position. If the value is small, the accuracy of position is high.
HL Heading line
A graphic line on a radar presentation drawn from the consistent common reference point
to the bearing scale to indicate the heading of the ship
H up Head up
Own ship’s heading line is always pointed to the top center of the radar display.
I
IR Radar Interference Rejecter
L
LL Latitude/ Longitude coordinate system
Log A device measures the speed through the water.
Lost AIS target A target symbol representing the last valid position of an AIS target before the reception of its
data was lost, or its last dead-reckoned position.
Lost tracked target One for which target information is no longer available due to poor, lost or obscured signals.
LP Long Pulse
M
MMSI Maritime Mobile Service Identity
MOB Man Over Board
MP Medium Pulse
N
NM 1NM=1852m
NMEA National Marine Electronics Association
NSK North Stabilization Kit
N up North up
The north is always pointed to the top center of the radar
displa
y.
O
Own track Display function of own ship’s track
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