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 OverBoard
MON
Performance monitor
MP
Medium Pulse
N
NM
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.
POSN
POSitioN
PRF
Pulse Repetition Frequency
The number of radar pulses transmitted each second.
PROC
PROCess
Radar signal processing function
R
Radar beacon
A navigation aid which responds to the radar transmission by
generating a radar signal to identify its position and identity
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