USCG Exam Practice · Light List, ranges, and light characteristics
A mariner observes a light that shows three flashes in a group, then a period of darkness, then repeats. This light is charted as which characteristic?
- AFl(4)
- BIso
- CFl(3)✓ correct
- DFFl
Why C is correct
Group Flashing — 3, charted as Fl(3), produces three flashes per group at a fixed period. Fl(4) would produce four flashes per group. Iso has equal light and dark periods with no grouping. FFl is a fixed light with a single superimposed brighter flash.
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