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USCG Exam PracticeLight List, ranges, and light characteristics

A mariner observes a light that shows three flashes, then a period of darkness, then three flashes again, repeating at a fixed period. What is the correct Light List abbreviation for this characteristic?

  1. A. Fl(4)
  2. B. Iso
  3. ✓ Fl(3)Correct
  4. D. FFl

Why C is correct

Group Flashing — 3, abbreviated Fl(3), produces three flashes per group at a fixed period. Fl(4) produces four flashes per group, and FFl is a fixed light with a superimposed brighter flash. (Light List — Fl(3))

Cited:Light List — light-characteristic (Fl(3))

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A mariner observes a light that shows three flashes, then a period… — USCG Exam Practice · CaptainsGround