USCG Exam PracticeLight List, ranges, and light characteristics
A light charted as 'Fl R 4s' produces which characteristic?
- ✓ A single red flash every 4 seconds, with the period of light shorter than the period of darknessCorrect
- B. A continuous red light interrupted by a dark period every 4 seconds
- C. Equal periods of red light and darkness totaling 4 seconds
- D. A red light with a brighter flash superimposed every 4 seconds
Why A is correct
A Flashing (Fl) light produces a single flash repeated at regular intervals where the duration of light is shorter than the duration of darkness. The characteristic string 'Fl R 4s' denotes a red flash every 4 seconds. (Light List — Fl)