Rules of the Road · General & Definitions
A vessel is 'underway' as defined by 72 COLREGS when she is:
- AMaking way through the water under her own power
- BNot at anchor, aground, or made fast to the shore✓ Correct
- CMoving through the water at any speed
- DProceeding to a destination under engine power
Explanation
Rule 3(i) defines 'underway' as a vessel not at anchor, not made fast to the shore, and not aground. A vessel can be underway but stopped — with no way on — and is still 'underway' by this definition, which is important for light and sound signal requirements.
Authority: 72 COLREGS Rule 3(i)
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