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VHF Data Link. The AIS channels of AIS 1 and AIS 2.


Visual Display Unit.


Very High Frequency. (30 to 300 MHz)


Very Low Frequency. (30 to 300 kHz)


A unit of electric potential and electromotive force. Equal to the difference of electric potential between two points on a conducting wire, carrying a constant current of one ampere when the power dissipated between the points is one watt. The symbol for the volt(s) is V.


Vessel Traffic Service. IMO Resolution A.857 (20), defines a Vessel Traffic Service (VTS) as ‘a service implemented by a Competent Authority that is designed to improve safety and efficiency of vessel traffic, and to protect the environment. The service shall have the capability to interact with traffic and respond to traffic situations developing situations in the VTS area’. It is referenced in SOLAS Chapter V, Regulation 12.