BOTH INTERNATIONAL & INLAND Which light(s) is/are required by a 200-meter vessel at anchor?

Correct Answer: Option D — Any available working lights to illuminate the decks

Rule 30(b) states that a vessel of 100 meters or more in length shall use available working or equivalent lights to illuminate her decks while at anchor. This requirement enhances visibility and safety, ensuring the vessel is clearly identifiable to other traffic operating in the vicinity during periods of restricted visibility.