Definition
Rhythms are allocated so that a mark can be identified at night from its light alone. Composite group flashing Fl(2+1) is reserved for preferred channel marks. Group flashing two, Fl(2), in white indicates isolated danger. White Q and VQ rhythms belong to cardinals. Morse A, isophase, occulting and LFl 10s in white denote safe water. Lateral lights use red or green in any other rhythm, and special marks use yellow.
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