Isophase buoy lights indicate which relation between darkness and light?

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

Isophase buoy lights indicate which relation between darkness and light?

Isophase buoy lights use a 50/50 duty cycle: the light is on for the same amount of time as it is off. In other words, the period of darkness equals the period of light. For a 6-second cycle, that would be 3 seconds lit and 3 seconds dark, repeating. This equal-on/equal-off cadence distinguishes it from patterns where darkness lasts longer or shorter than the light, or where there is no light at all.

Isophase buoy lights use a 50/50 duty cycle: the light is on for the same amount of time as it is off. In other words, the period of darkness equals the period of light. For a 6-second cycle, that would be 3 seconds lit and 3 seconds dark, repeating. This equal-on/equal-off cadence distinguishes it from patterns where darkness lasts longer or shorter than the light, or where there is no light at all.

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