- XXI -
H up
Head up
Own ship’s heading line is always pointed to the top center of the radar
display.
I
IHO
International Hydrographic Office
IMO
International Maritime Organization
Interswitch Unit
A device to switch over two or more radar display units and two or
more scanners.
IR
radar Interference Rejecter
ISW
InterSWitch
L
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
MON
Performance monitor
MP
Medium Pulse
N
NM
Nautical Mile
1nm=1852m
N up
North up
The north is always pointed to the top center of the radar display.
O
Own track
Display function of own ship’s track
P
PI
Parallel Index line
Past positions
Equally time-spaced past position marks of a tracked or AIS target and
own ship.
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