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Two approaching sailing vessels when wind side for one of them cannot be determined with certainty

  • Description of scenario: Vessel A: sailing vessel
    Vessel B: sailing vessel
    Area: On the high seas
    Visibility: Good (Vessels in sight of one another)
    Vessel A and vessel B are approaching one another, so as to involve risk of collision
    Vessel A has the wind on the port side and sees vessel B to windward and cannot determine with certainty whether vessel B has the wind on the port or on the starboard side
  • Rule(s) to be applied: Rule 12 (Sailing vessels)
  • Applying the Rule(s) and comments: In accordance with Rule 12 (a)(iii) (Sailing vessels), when two sailing vessel are approaching one another, so as to involve risk of collision and if a vessel with the wind on the port side (vessel A) sees a vessel to windward (vessel B) and cannot determine with certainty whether the other vessel (vessel B) has the wind on the port or on the starboard side, she (vessel A) shall keep out of the way of the other (vessel B).
    In accordance with Rule 12 (b) (Sailing vessels), the windward side shall be deemed to be the side opposite to that on which the mainsail is carried or, in the case of a square rigged vessel, the side opposite to that on which the largest fore-and-aft sail is carried.

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This project has been funded with support from the European Commission.This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.