USCG Exam Practice · Light List, ranges, and light characteristics
A light charted as 'Fl R 4s' produces what characteristic?
- AA single red flash every 4 seconds, with the duration of light shorter than the duration of darkness✓ correct
- BA continuous red light interrupted by a short eclipse every 4 seconds
- CEqual periods of red light and darkness totaling 4 seconds
- DA fixed red light with a brighter flash superimposed every 4 seconds
Why A is correct
A flashing (Fl) light produces a single flash regularly repeated with the duration of light shorter than the duration of darkness. The characteristic string 'Fl R 4s' denotes a red flash every 4 seconds. Light List — light-characteristic (Fl).
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