Nautical Symbol Help?

rovingfisherman

Active Member
Can anyone tell me what this nautical symbol
represents? It does appear anywhere in the symbols, abbreviations and terms publications for paper or electronic charts that I can see. It appears in areas of rock, sand, mud etc and in depths of + 300ft?
Thanks
 

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Good one, GS! :)

Kelp bed, perhaps? (altho @ 300 ft depth - it seems unlikely)
 
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Military live fire/explosion zone ??? The last time someone played guess the symbol that is what it turned out to be. Not certain for sure it is this one.
 
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