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 Acronym for RAdio Detection And Ranging
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 stabilization
Relative course The direction of motion of a target relative to own ship motion
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
RM Relative Motion
A display on which the position of own ship remains fixed, and all targets move relative to own
ship.
RM(R) Relative Motion. Relative Trails.
RM(T) Relative Motion. True Trails.
ROT Rate of Turn
Change of heading per time unit.
Route A set of waypoints.
RR Range Rings
S
SART Search And Rescue Transponder
Radar transponder capable of operating in the 9GHz band
SBAS Satellite-Based Augmentation System
Generic technique for correcting the error of the GPS using the geostationary satellite
This is used for the positioning accuracy of GPS higher.
Sea stabilization A display mode in which speed and course information are referred to the sea.
Sea state Status of the sea condition due to the weather environment, expressed as a sea state 0 for flat
conditions with minimal wind, to sea state 8 for very rough sea conditions.
SET The current direction for manual correction or the current speed on the horizontal axis of the
2-axis log is displayed.
Sleeping AIS target A target indicating the presence and orientation of a vessel equipped with AIS in a certain
location.
sm Statute mile 1sm=1609.344m
SOG Speed Over the Ground
The speed of the ship relative to the earth, measured on board of the ship.
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