What type of vessel is indicated if only the lights shown in illustration D045RR are displayed?

The correct indication of a vessel displaying the lights shown in illustration D045RR indicates it's a pilot vessel. In maritime navigation, pilot vessels are characterized by specific light configurations which are distinct from those of other types of vessels.

Pilot vessels typically have a white light or two white lights at the masthead, indicative of their role in assisting larger vessels by providing pilotage services. This function is critical in many harbors and approaches where local knowledge is essential for safe navigation.

The other vessel types each have their own distinct light requirements based on their operational status and characteristics. Cargo vessels, tugboats, and fishing vessels each display different combinations of lights that signify their specific roles and operational scenarios on the water. For instance, a fishing vessel may show different lights when trawling or at anchor, while a tugboat may exhibit a tow light or different marker lights indicating its towing status. Recognizing these lights is crucial for ensuring safe navigation and compliance with the Rules of the Road.