🔍 Key Concepts

• Remember that identifying lights are the special red/green/white combinations for vessels like trawling, fishing, not under command, and pilot vessels under the Navigation Rules (COLREGS). • Think about which of these vessel types is also required to carry a normal masthead steaming light in addition to its identifying lights, and where that masthead light must be placed. • Consider the length thresholds where power-driven vessel lights (masthead, sidelights, sternlight) are required, and how those interact with special operations lights.

💭 Think About

• For each choice, ask: does this vessel normally show only special lights, or special lights plus normal power-driven lights? • Visualize the light pattern: where would the special identifying lights be, and where would a masthead steaming light have to go in relation to them (forward/aft, higher/lower)? • Compare the light requirements in the Rules for vessels not under command, trawling, fishing, and pilotage duty—which one specifically mentions a masthead light in addition to the identifying lights, and its relative position?

✅ Before You Answer

• Verify in the Navigation Rules (Part C – Lights and Shapes) under Rule 23 (Power-driven vessels underway) and the special vessel rules: Rule 26 (Fishing vessels), Rule 27 (Vessels not under command or restricted in their ability to maneuver), and Rule 29 (Pilot vessels). • Check which rule explicitly requires a masthead light placed abaft and higher than the identifying lights, not just "may carry" or "instead of" a masthead light. • Confirm whether the length of the vessel in each option affects whether a full set of normal power-driven vessel lights, including a masthead light, is required in addition to the special lights.