JRC JMA-3400 Series Instruction Manual page 45

ETA Estimated Time of Arrival
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.
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.
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.
IR Radar Interference Rejecter
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
MMSI Maritime Mobile Service Identity
MOB Man Over Board
MP Medium Pulse
Navionics Electronic navigational chart supplier headquartered in Italy.
Electronic Reference Charts issued by Japan Hydrographic Association.
new pec
NM 1NM=1852m
NMEA National Marine Electronics Association
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GLOSSARY
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