Handbook of the Nautical Rules of the Road by Llana & Wisneskey

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Rule 28 -- Vessels Constrained by Their Draft


A vessel constrained by her draft may, in addition to the lights prescribed for power-driven vessels in Rule 23, exhibit where they can best be seen three all-round red lights in a vertical line, or a cylinder.


International Rule 18(d) provides for vessels constrained by their draft and attempts to favor them with regard to other vessels because of restrictions on their movement. This Rule gives the special navigation lights and shape that mark a vessel constrained by draft.

The Inland Rules did not adopt the concept of "vessel constrained by draft," and there is, therefore, no Inland Rule 28.


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Rule 29