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From the 72 COLREGS, Navigational Rules of the Road. International

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Rule 3 (h)the term "vessel constrained by her draft" means a power driven vessel which, because of her draft in relation to the available depth and width of the navigable water is severelyrestricted in her ability to deviate from the course she is following.

This is an International Rule. It has NO bearing in the US Inland rules.

A vessel who cannot alter course due to the draft (the distance from the waterline to the keel) of her hull. For example if the draft is 10ft and on her current course the water depth is 11 ft but to the port and starboard of her the water depth is 5 ft. she is thus constrained to that course (she cannot deviate from it) because of her draft. She will display a day shape in the form of a can or cylinder, it can resemble a can of beer, remember a "draft of beer" and 3 red all round lights at night.

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Q: Meaning of vessels constrained by their draft?
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