Annex II · 2 — Signals for trawlers
(a) Vessels of 20 m of more in length when engaged in trawling, whether using demersal or pelagic gear shall exhibit:
(i) when shooting their nets : two white lights in a vertical line ;
(ii) when hauling their nets : one white light over one red light in a vertical line ;
(iii) when the net has come fast upon an obstruction : two red lights in a vertical line.
(b) Each vessel of 20 m or more in length engaged in pair trawling shall exhibit :
(i) by night, a searchlight directed forward and in the direction of the other vessel of the pair ;
(ii) when shooting or hauling their nets or when their nets have come fast upon an obstruction, the lights prescribed in 2(a) above.
(c) A vessel of less than 20 m in length engaged in trawling, whether using demersal or pelagic gear or engaged in pair trawling, may exhibit the lights prescribed in paragraphs (a) or (b) of this section, as appropriate.