1) When she is the overtaking vessel
2) When the other vessel is a Fishing Vessel or Restricted in her Ability to Manoeuvre (RAM) or Not Under Command (NUC).
3) A Sailing Vessel should not impede a Vessel Constrained by Draught (CBD).
A vessel under 20 meters may not impede any vessel which only navigate within a narrow channel or fairway.
Please see the link provided below.
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