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Trial maneuver : A graphical simulation facility used to assist the operator to perform a
proposed maneuver 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
UKHO : United Kingdom Hydrographic Office
Update CD : Chart CD containing the chart data updated from Base CD. This can
be used when Base CD data has been imported.
USER CODE : A user-specific code assigned by JRC. Required in using ARCS and
S-63 charts.
UTC : Universal Time, Coordinated
VRM : Variable Range Marker
VDR : Voyage Data Recorder
WOL : Wheel Over Line
WOP : Wheel Over Point
WPT : Waypoint
WPT-WPT : The division of the leg specified by two points. Displays data between
two consecutive waypoints.
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.
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