I wonder which
lights should an anchored towing vessel with a towed vessel show .
I guess both should show their
anchor lights.
Summary Rule 24
All possible measures shall be taken to indicate the nature of the relationship between the towing vessel and the vessel being towed as authorized by Rule 36, in particular by illuminating the towline.
Colreg state that:
Rule 7
Risk of Collision
(a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist.
(If the collision existed, then there is no doubt that was deemed to exist)
...
Rule 21
(d) "Towing light" means a yellow light having the same characteristics as the "stemlight" defined in paragraph (c) of this Rule
...
(iv) a towing light in a vertical
line above the stemlight;
...
The vessel being towed
(e) A vessel or object being towed, other than those mentioned in paragraph (g) of this Rule, shall exhibit
(I) sidelights;
(ii) a stemlight;
(iii) when the length of the tow exceeds 200 metres, a diamond shape where it can best be seen.
...
When not posible
(i) Where from any sufficient cause it is impracticable for a vessel not normally engaged in towing operations to display the
lights prescribed in paragraph (a) or (c) of this Rule, such vessel shall not be required to exhibit those
lights when engaged in towing another vessel in distress or otherwise in need of assistance. All possible measures shall be taken to indicate the nature of the relationship between the towing vessel and the vessel being towed as authorized by Rule 36, in particular by illuminating the towline.