For a vessel of 75 meters at anchor, which statement is true?

For a vessel of 75 meters at anchor, the requirement to show lights is significant for ensuring visibility and safety. An all-round white light displayed forward is essential for signaling the presence of the vessel to other boats. This light helps prevent collisions by indicating where the vessel is located, especially in conditions of reduced visibility.

Additionally, a second all-round white light shown aft is important for larger vessels, as it further enhances their visibility from different angles. The combination of these two lights ensures that the vessel is identifiable from both the front and rear, which is crucial for maritime safety.

Furthermore, using working lights to illuminate the decks can be permitted, as this enhances operational safety for any activities carried out on the deck. However, it is important that these working lights do not interfere with the required navigation lights or create confusion for other vessels.

Therefore, the answer encompasses all these requirements, highlighting the necessity of both all-round white lights and the potential use of working lights, making it clear that all of the statements provided are true for a vessel of this size at anchor.