Underway

Under international rules a vessel is 'underway' whenever she is not at anchor, moored, aground, or made fast to the shore — even if she is not currently moving through the water.

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Related U-terms

USCG

United States Coast Guard — the US federal service responsible for maritime safety, securi…

Upwind

Toward the wind's source.

U.T.C.

Coordinated Universal Time — the modern reference time (replacing GMT) used for navigation…

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