Which power-driven vessel is NOT required to carry a light in the position of the after masthead light?

The answer indicates that a vessel of 45 meters in length trolling is not required to carry a light in the position of the after masthead light. In maritime navigation, the requirements for navigation lights on power-driven vessels vary based on the size and type of vessel as well as the nature of the activity being conducted.

Specifically, a vessel engaged in trolling is typically considered a fishing vessel, and the regulations state that fishing vessels under 50 meters in length are only required to display certain lights. The after masthead light, which is typically used to indicate the presence of larger power-driven vessels, is not mandated for fishing vessels engaged in specific activities such as trolling.

In contrast, tugboats and vessels under 20 meters have specific lighting requirements that they must adhere to, which may include displaying an after masthead light. Understanding these distinctions is crucial for navigating compliance with navigation rules and ensuring safety at sea.