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A weed mark showing kelp on the seabed.
Also known as: Seaweed chart symbol, Weed symbol chart
On a nautical chart kelp is drawn as a small weed-like mark, showing seabed vegetation that can foul propellers and obscure the bottom.
Marks kelp or heavy weed growing on the seabed.
Contexts: Navigation
Often grows on rock, so its presence is itself evidence about the bottom beneath it.
Contexts: Navigation
A small mark of curving strands rising from the seabed position, in the shape of a plant fronds.