Line marker

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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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