Sail Skills - ColRegs
Back 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>Constrained by Draught
Rule 28 Vessel Constrained by her Draught

A vessel constrained by her draught in addition to the:

masthead lights

of a power-driven vessel underway
Lights - General Shapes Power-Driven Towing and Pushing Sail and Oars Fishing Not Under Command Restricted Constrained Draught Pilot Vessels Anchored Aground Mnemonics All Animations Power-driven vessel underway from ahead
Note: Shapes
may exhibit:

where they may best be seen:

three all-round red lights in a vertical line
A vessel constrained by her draught
(in the original photo the cylinder was in fact obscured by a mast fitting!)

The definition of vessel constrained by her draught refers only to a power-driven vessel
A power-driven vessel underway
Vessel constrained by her draft seen from ahead Vessel constrained by her draught Vessel constrained by her draught
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