Lights identification quiz
See a navigation-light pattern; identify what kind of vessel you are looking at. Drawn from all 14 COLREG configurations in Rules 23–30. Use this for STCW oral-exam preparation, watchkeeping refresher, or just to keep night-time observation sharp.
When to use this tool
STCW oral-exam preparation for OOW/Master/Chief Mate certifications, watchkeeping refresher after long shore leave, bridge-team night-vision + pattern-recognition maintenance.
Regulatory basis
COLREG Rules 20-31 (Part C, Lights + Shapes). Rule 20: application from sunset to sunrise + in restricted visibility. Rule 21: definitions of masthead + sidelight + sternlight + towing + all-round. Rules 23-30: specific configurations by vessel type + operational status.