USCG Exam Practice · Light List, ranges, and light characteristics
A Fixed and Flashing (FFl) light is best described as which of the following?
- AA light that alternates between two different colours at a fixed interval
- BA continuous light upon which a brighter flash is superimposed at intervals✓ correct
- CA light with equal periods of light and darkness, with one period fixed and one flashing
- DA group-flashing light with a fixed number of flashes per period
Why B is correct
Fixed and Flashing (FFl) is defined as a fixed light with a brighter flash superimposed at intervals, used on certain channel-edge structures. It is not an alternating light, not an isophase light, and not a group-flashing light.
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