Mariners Learning Practice Test

Which combination of lights and dayshape indicates a vessel constrained by its draft?

Three red lights in a vertical line and a cylinder dayshape Three red lights in a vertical line and a ball dayshape Three red lights and no dayshape A white light and dayshape

Correct Answer:

Three red lights in a vertical line and a cylinder dayshape

Explanation:

Vessels signal special limitations with specific lights and day shapes so others understand their maneuvering capability. For a vessel constrained by its draft, the standard signal is three all-around red lights in a vertical line, paired with a cylinder dayshape. The red lights warn nearby vessels to maintain clear, and the cylinder shape confirms this status during daylight or in visibility conditions. The other options don’t match this exact pairing: they either use a different dayshape, omit the dayshape, or present a different light pattern that doesn’t indicate draft constraints. So this combination precisely communicates that the vessel is constrained by its draft.

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