International Regulations for Preventing Collisions at Sea (COLREGS)
RULE TEXT
A vessel constrained by her draught may, in addition to the lights prescribed for power-driven vessels underway, exhibit where they can best be seen three all-round red lights in a vertical line, or a cylinder (day shape).
PRACTICE SCENARIOS (1 available)
RULE 28 — CONSTRAINED BY DRAFT (DAY)
Daytime. A large vessel in the channel displays a single black cylinder. Who gives way?
Bridge visual — nav lights / day shapes
TEST YOURSELF ON Rule 28
1 interactive scenario — radar PPI and bridge visual modes. 20-second timer per question.