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>Lights & Shapes>Restricted Ability to Manoeuvre>Dredging or Underwater Operations Obstruction Rule 27 Vessels Restricted in Their Ability to Manoeuvre  Dredging or Underwater Operations: Where an Obstruction Exists  If a vessel is:  restricted in her ability to manoeuvre and engaged in dredging or underwater operations and an obstruction exists A vessel engaged in underwater operations where an obstruction exists on her starboard side - not making way back to top These signals:  are not distress signals and need not be  exhibited by vessels less than 12m - except vessels engaged in diving operations - but a reduced requirement can apply to these A vessel engaged in underwater operations where an obstruction exists Where an obstruction exists, she also exhibits in vertical line to indicate the side on which:  there is an obstruction, two: balls red all-round lights  a vessel may pass, two: diamonds green all-round lights Vessel engaged in underwater operations not making way obstructed on her starboard side This vessel is making way but changes the side on which she has the obstruction: A vessel recovering a navigation mark - restricted in her ability to manoeuvre A small vessel engaged in diving operations A vessel engaged in underwater operations where an obstruction exists A vessel engaged in mine clearance operations General requirements Operations with obstruction Diving operations smaller vessels Mine clearance
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