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Sound
⚫ short blast 1s
─ long blast 4 to 6s
alter to starboard ⚫
alter to port ⚫⚫
astern ⚫⚫⚫
I do not understand ⚫⚫⚫⚫⚫ or more
overtaking starboard side ─ ─ ⚫
overtaking port side ─ ─ ⚫⚫
If agree ─ ⚫─ ⚫ else disagree ⚫⚫⚫⚫⚫ or more
In restricted visibility (2 cases)
1. Power driven vessel
Making way ─ no more than 120s or 2m
Under way ─ ─ no more than 120s or 2m
2. Others (sailing vessel, engaged in fishing, RAM, NUC)
─ ⚫⚫no more than 120s or 2m
Vessel being towed ─ ⚫ ⚫⚫
Pilot Vessel ⚫⚫⚫⚫
─ 1 prolonged to warning or going to start moving
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