Originally Posted by BubbleheadMd
Just keep your head on a swivel, know your ship lighting configurations (tug with tow, anyone?).
Bueller, Bueller? Navigation Rules Online
Rule 24 - 2 masthead lights, a towing light above the stern light or 3 vertical lights or 2 vessels displaying lights. Any time you see a vessel displaying vertical lights or 2 vessels close to each other in a line, stay away!