Sound

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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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