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Glossary term Description
VTS, VTMS VTMIS

Various types of vessel traffic management system. These are usually radar assisted systems to advise masters and pilots of other vessel traffic in their vicinity within a waterway.

voyage memo

Used to describe a document giving details of a vessel's previous ports of call, including arrival and departure dates and times, often required by countries with cargo or country boycotts in place. This document has mainly been superseded by ISPS pre-arrival document requirements.

VoIP

voice over internet protocol

VLOR

very large ore carrier

VLGC

very large gas carrier

VLCC

very large crude carrier (200,000-319,999 dwt)

viscosity (Latin: viscum - tenacity) Degree of resistance to flow in a fluid or semifluid for gas, caused by internal friction
VHF

very high frequency. Radio frequency 

VDR

voyage data recorder