What lights does a composite unit exhibit?

A composite unit, which typically consists of a tow or a barge-like structure that is being pushed or towed, is considered a power-driven vessel. As such, it exhibits lights that are appropriate for a power-driven vessel of its size. The regulations dictate that the masthead light, sidelights, and sternlight should be displayed, just as with a traditional power boat. This ensures that the vessel is clearly identifiable at night and during periods of reduced visibility, maintaining safety on the water.

The other choices do not align with the characteristics of a composite unit. A sailing vessel would have a different light configuration focused on sails rather than propulsion, while fishing vessels have specific lights that indicate the nature of their activity, which does not apply to composite units operating under power. Finally, a vessel exhibiting no lights would be dangerously non-compliant with COLREGs regulations and pose a significant risk to navigation. Thus, the choice indicating lights for a power-driven vessel of its size is the correct representation of a composite unit’s lighting requirements.