Navigation General · Light Characteristics
Which light characteristic can indicate an ISOLATED DANGER mark in U.S. waters?
- AFixed white
- BQuick flashing white
- CGroup flashing (2) white — Fl(2) W✓ Correct
- DIsophase red
Explanation
Isolated danger marks, when lighted, show a group flashing light with two flashes — Fl(2) — in white. This distinguishes them from lateral marks.
Authority: 33 CFR 62 (U.S. ATON System)
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