Sail Skills - ColRegs Free Guide to ColRegs (the International Regulations for Preventing Collisions at Sea, the IRPCS or Collision Regs). Guidance covers all aspects with animations, pictures and diagrams. Aimed at small vessel users but suitable for professional mariners. Especially recommended for RYA examination candidates.
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ColRegs Home>ColRegs>Steer & Sail Rules>Vessels in Sight of One Another>Power-Driven Vessels Crossing When two power-driven vessels are crossing so as to involve risk of collision, the vessel that has the other on her starboard side shall: keep out of the way and avoid crossing ahead of the other if circumstances permit Some people think of the sidelights as like traffic lights ashore. With care, it’s a useful memory jogger Its important to remember that a vessel can be abaft the beam and still be crossing - the situation with the first encounter in the animation Power-driven vessels crossing: the lower-left vessel encounters other vessels crossing They are all on her starboard side Power-driven vessels crossing: the arcs of the sidelights and sternlight are shown Power-driven vessels meeting head-on back to top Head-on When two power-driven vessels are meeting on: reciprocal (opposite) or nearly reciprocal courses so as to involve risk of collision, each shall: alter course to starboard to pass portside to portside Reminder It’s worth restating that these rules apply only to vessels in sight of one another Entirely different rules apply to vessels which are: not in sight of one another and navigating in or near an area of restricted visibility A sailing vessel overtaking a small power boat Diagram: symbol stand-on vessel Stand-on vessel Diagram: symbol give-way vessel Give way vessel Overtaking Vessels: retricted in ability to manoeuvre, sailing and engaged in fishing Two vessels under sail approaching Responsibilities between vessels Sailing Vessels Two power-driven vessels approaching Power-driven Vessels
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