Definition
A vessel intending to overtake in a narrow channel or fairway sounds two prolonged blasts followed by one short blast to pass on the other vessel's starboard side, or two prolonged followed by two short to pass on her port side. The vessel to be overtaken indicates agreement with one prolonged, one short, one prolonged, one short. Nearing a bend where vision is obscured, sound one prolonged blast, answered by one prolonged from any vessel beyond.
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