Which length category requires two separate masthead lights on a vessel?

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Multiple Choice

Which length category requires two separate masthead lights on a vessel?

Explanation:
Two masthead lights are required for vessels 50 meters or more in length. This helps other mariners clearly judge the size and presence of a large vessel at night, because the two lights arranged in a vertical line make the vessel’s length more conspicuous. Vessels shorter than 50 meters need only one masthead light, even though they still must display a masthead light if they’re 20 meters or longer. The threshold of 50 meters is specifically what triggers the two-light requirement.

Two masthead lights are required for vessels 50 meters or more in length. This helps other mariners clearly judge the size and presence of a large vessel at night, because the two lights arranged in a vertical line make the vessel’s length more conspicuous. Vessels shorter than 50 meters need only one masthead light, even though they still must display a masthead light if they’re 20 meters or longer. The threshold of 50 meters is specifically what triggers the two-light requirement.

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