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TM : True Motion. A display across which the own ship and targets move
with their own true motions.
To W PT : To Waypoint (To WPT)
Trails : Tracks displayed by the radar echoes of targets in the form of an
afterglow
Trial manoeuvre : A graphical simulation facility used to assist the operator to perform a
proposed manoeuvre for navigation and collision avoidance purposes
True vector : A vector representing the predicted true motion of a target, as a result
of input of the course and speed of the own ship
TT : Target Tracking
TTG : Time To Go. Time to next waypoint.
TXRX : Transmitter-Receiver Unit
UTC : Universal Time, Coordinated
VRM : Variable Range Marker
VDR : Voyage Data Recorder
WOL : Wheel Over Line
WPT : Waypoint
XTD : Cross Track Distance
XTL : Cross Track Limit
Activated target : A target representing the automatic or manual activation of a sleeping
AIS target for the display of additional information
Associated target : A target simultaneously representing a tracked target and a AIS target
which are decided as the same
Chirp : A type of transmission waveform with intra-pulse frequency
modulation used by solid-state radars. Its radio wave type is classified
as Q0N.
Clutter : Unwanted reflections on a radar screen, from sea surface, rain or
snow.
Display : Screen displayed on the LCD
Frequency deviation range : The range of variation of the Q0N frequency used for transmission
waves of a solid-state radar. Generally, the greater the frequency
deviation range, the higher the resolution in the range direction.
Interswitch Unit : A device to switch over two or more radar display units and two or
more radar antennas
Leg : Line between two consecutive waypoints
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.
Power amplifier : A radio frequency amplifier circuit consisting of semiconductor
elements used for solid-state radars. It employs a high frequency, high
power FET.
Primary : Main positioning sensor
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