What is the topmark for a Special Purpose Buoy?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

What is the topmark for a Special Purpose Buoy?

Special Purpose Buoys use a yellow topmark in the shape of a cross. That yellow cross, or X, identifies a buoy as having a special function rather than a standard navigational marker. In contrast, a single red sphere marks Safe Water, two black spheres indicate an isolated danger, and two black cones denote cardinal marks. So the yellow cross is the topmark that uniquely identifies a Special Purpose Buoy and tells you to follow any local instructions or warnings associated with that buoy.

Special Purpose Buoys use a yellow topmark in the shape of a cross. That yellow cross, or X, identifies a buoy as having a special function rather than a standard navigational marker. In contrast, a single red sphere marks Safe Water, two black spheres indicate an isolated danger, and two black cones denote cardinal marks. So the yellow cross is the topmark that uniquely identifies a Special Purpose Buoy and tells you to follow any local instructions or warnings associated with that buoy.

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