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1. Floating equipment at work and stationary vessels carrying out work or sounding or measuring operations shall carry:
(a) On the side or sides on which the fairway is clear, the “entry permitted” board E.1 (annex 7);
and, as appropriate,
(b) On the side on which the fairway is not clear, the “no entry” board A.1 (annex 7), placed at the same height as the board prescribed in (a) above.
5. The competent authorities may waive the obligation to carry the lights prescribed in paragraphs 1 and 2 above under (a) and (b).