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A marked area where the bottom is obstructed.
Also known as: Foul area chart symbol, Obstructed bottom symbol
On a nautical chart foul ground is drawn as an outlined area marking a bottom obstructed by debris, old moorings or rock, where anchoring or trawling is inadvisable.
Marks a seabed area obstructed enough to make anchoring or trawling inadvisable.
Contexts: Navigation
Warns about what the bottom will do to gear rather than about clearance for a hull, which is a different kind of danger from a wreck.
Contexts: Navigation
An enclosed area outlined with a dotted or dashed line, with a marking inside identifying the ground as foul.