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Other Marks

Isolated Danger Mark

An isolated danger mark marks a danger such as a wreck or a rock. It is placed over the danger. Light: White, group flashing 2: Fl(2).

Safe Water Mark

This indicates navigable water all round the mark; it may be used to mark the middle of a channel. Light: White, isophase, occulting 1 long flash every 10 seconds or morse letter A.