Rules of the Road · Restricted Visibility Signals
You are on watch in dense fog. You hear one prolonged blast followed by two short blasts at 2-minute intervals. This signal indicates the other vessel is most likely:
- AA power-driven vessel making way
- BA power-driven vessel stopped and not making way
- CA not-under-command, sailing, fishing, or towing vessel✓ Correct
- DA vessel at anchor
Explanation
One prolonged + two short every 2 minutes is the Rule 35(c) signal for NUC, RAM, constrained by draft, sailing, fishing, and towing/pushing vessels. One prolonged every 2 minutes = power-driven making way (35(a)). Two prolonged every 2 minutes = power-driven not making way (35(b)). Bell = at anchor (35(g)).
Authority: 72 COLREGS Rule 35(c)
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