(a) A vessel engaged in fishing. whether underway or at anchor. shall exhibit only the lights and shapes prescribed in this Rule.
(b) A vessel when engaged in trawling. by which is meant the dragging through the water of a dredge net or other apparatus used as a fishing appliance. shall exhibit:
(i) Two all-round lights in a vertical line. the upper being green and the lower white. or a shape consisting of two cones with their apexes together in a vertical line one above the other;
(ii) A masthead light abaft of the higher than the all-hound green light; a vessel of less than 50 meters in length shall not be obliged to exhibit such a light but may do so;
(iii) When making way through the water, in addition to the lights prescribed in this paragraph, sidelights and a stern light.
Extract from Rule 35 Sound signals in restricted visibility
In or near an area of restricted visibility. whether by day or night. the signals prescribed in this Rule shall be used as follows:
(a) A power-driven vessel making way through the water shall sound at intervals of not more than 2 minutes one prolonged blast.
(b) A power-driven vessel underway but stopped and making no way through the water shall sound at intervals of not more than 2 minutes two prolonged blasts in succession with an interval of about 2 seconds between them.
(c) A vessel not under command, a vessel restricted in her ability to maneuver. a vessel
constrained by her draught. a sailing vessel. a vessel engaged in fishing and a vessel engaged in towing or pushing another vessel shall. instead of the signals prescribed in paragraphs (a) or (b) of this Rule, sound at intervals of not more than 2 minutes three blasts in succession, namely one prolonged followed by two short blasts.
(f) When a pushing vessel and a vessel being pushed ahead are rigidly connected in a composite unit they shall be regarded as a power-driven vessel and shall give the signals prescribed in paragraphs (a) or (b) of this Rule
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