Which vessels do not show running lights when underway and not making way?

The option indicating that vessels not under command (NUC), vessels restricted in their ability to maneuver (RAM), and fishing or trawling vessels are not required to show running lights when underway and not making way is accurate due to specific navigation rules. Under the International Regulations for Preventing Collisions at Sea (COLREGS), these types of vessels have unique circumstances that create exceptions to typical lighting requirements.

For instance, a vessel not under command is unable to maneuver as required, often due to mechanical failure or other emergencies, and thus is not required to display running lights when it is stationary. Similarly, a vessel that is restricted in its ability to maneuver due to the nature of its work or a fishing vessel actively engaged in fishing is also not required to exhibit the usual running lights in certain situations.

This aligns with maritime safety regulations aimed at preventing collisions. The different classes of vessels have these exceptions to ensure that their inability to proceed does not mislead other mariners about their operational status. In contrast, all other vessels, like powerboats, sailboats, or ferries, are generally required to show running lights when underway.