Rules of the Road · Restricted Visibility
Under Rule 19(e), if a vessel hears forward of her beam the fog signal of another vessel whose position has not been ascertained, she shall:
- AAlter course to starboard to pass the unidentified vessel on her port side
- BSound five short blasts and proceed at slow ahead
- CReduce speed to the minimum at which she can be kept on course, taking all way off if necessary, and navigate with extreme caution✓ Correct
- DImmediately anchor to await radar contact
Explanation
Rule 19(e) applies when only a fog signal is heard (no radar contact) forward of the beam. The response is to reduce to minimum steerage way — not to alter course, which could be toward the other vessel. Navigating with extreme caution is the mandate until the situation is clarified.
Authority: 72 COLREGS Rule 19(e)
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