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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
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
Radar cross-
section
Radar cross-section of a target determines the power density
returned to the radar for a particular power density incident on the
target
Range Rings A set of concentric circles labeled by distance from CCRP.
Reference target A symbol indicating that the associated tracked stationary target is
used as a speed reference for the ground stabilisation
Relative speed The speed of a target relative to own ship's speed data
Relative vector A predicted movement of a target relative to own ship's motion
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