Rules of the Road · Restricted Visibility
Under Rule 19(d), a vessel in restricted visibility SHALL NOT alter course to port for a vessel detected by radar:
- AAbaft the beam
- BAnywhere on the port bow
- CForward of the beam, except in the case of overtaking✓ Correct
- DForward of the beam on the starboard side only
Explanation
Rule 19(d)(i) prohibits an alteration of course to port for a vessel detected forward of the beam, unless overtaking. Turning to port toward an oncoming contact increases risk. The exception for overtaking reflects that bearing aft of the beam would allow a port turn safely.
Authority: 72 COLREGS Rule 19(d)(i)
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