Line marker

Line marker

In cave (and occasionally wreck) diving, line markers are used for orientation. Directional markers (commonly arrows) point the way to an exit (although no permanent guideline must exist); non-directional markers ("cookies") are purely personal markers that mark specific spots, or the direction of one's own exit at line intersections / T's. One important reason to be adequately trained before cave diving is that incorrect marking can confuse and fatally endanger not only oneself, but also other divers.

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