Clause 2 Signals for trawlers
Maritime Rules Part 22: Collision Prevention
(1) Vessels of 20 metres or more in length engaged in trawling, whether using demersal or pelagic gear, or involved in pair trawling, must exhibit—
(a) when shooting their nets:
two white lights in a vertical line; and
(b) when hauling their nets:
one white light over one red light in a vertical line; and
(c) when the net has come fast upon an obstruction:
two red lights in a vertical line; and
(d) when engaged in pair trawling by night:
a searchlight directed forward and in the direction of the other vessel of the pair.
(2) A vessel of less than 20 metres in length engaged in trawling, whether using demersal or pelagic gear or engaged in pair trawling, may exhibit the lights prescribed in Appendix 2.2(1).