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>Mine Clearance Operations back to top Vessel engaged in mine clearance operations - at anchor A mine is exploded during a USN exercise Image with Permission: Defense Visual Information Center Explosion of a mine during a USN training exercise A vessel engaged in mine clearance operations at anchor This vessel is under way: These signals:  are not distress signals and need not be  exhibited by vessels less than 12m indicate it is dangerous to approach to within 1000m Note that the remainder of the rule (about vessels restricted in their ability to manoeuvre) uses making way.  This is the only part that refers to underway 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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