GLOSSARY
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ETA Estimated Time of Arrival
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.
LORAN Long Range Navigation
A system in which position is determined from the intervals between signal pulses received from
widely spaced radio transmitters.
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
Navionics Electronic navigational chart supplier headquartered in Italy.
new pec
Electronic Reference Charts issued by Japan Hydrographic Association.
NM 1NM=1852m
NMEA National Marine Electronics Association
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