46 APPENDIX
Term Abbreviation
Trial TRIAL
Trigger Pulse TRIG
True T
True Motion TM
Tune TUNE
Ultrahigh Frequency UHF
Uninterruptible Power Supply UPS
Universal Time, Coordinated UTC
Universal Transverse Mercator UTM
Unstable UNSTAB
Variable Range Marker VRM
Variation VAR
Vector VECT
Very High Frequency VHF
Very Low Frequency VLF
Vessel Aground GRND
Vessel at Anchor ANCH
Vessel Constrained by Draught VCD
Vessel Engaged in Diving
Operations
DIVE
Vessel Engaged in Dredging or
Underwater Operations
DRG
Vessel Engaged in Towing
Operations
TOW
Vessel Not Under Command NUC
Vessel Restricted in
Manoeuvrability)
RIM
Vessel Traffic Service VTS
Vessel Underway Using Engine
UWE
Video VID
Visual Display Unit VDU
Voyage VOY
Voyage Data Recorder VDR
Warning WARNING
Water WAT
Water Tracking WT
Waypoint WPT
Waypoint Closure Velocity WCV
West W
Wheel Over Line WOL
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