Remembering Rule 5
RULE 5
Look-out
Every vessel shall at all times maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.
Mermaid painted house floating through the Gulf of Mexico
The importance of preserving good night vision: I doubt that the 'mermaid house' was displaying any lights when underway at night.
/fl