S.L. 425.1 Art. 31Mooringofboatby night.

By night there shall be moored at the seaward shoot of every tunny net a boat showing in a vertical line one over the other one metre apart two bright lights so fixed that the upper light shall be not less than three point one metres from the water line and of such a character as to be visible on a dark night with a clear atmosphere all round the horizon at a distance of not less than two nautical miles.