Just spent a couple hours poking around on forums and it seems these are Navionics all encompassing symbol for an area where there is some sort of restriction. From no discharge or no anchor to whales or bird nesting area.
Supposedly there is a software update that allows you to turn that layer off. I'm going to send them a note and I'll post their response. If I don't hear back, I'll go to their office in Wareham and ask.
Definitely need to shut the stupid things off some how...This is Massachusetts, I don't think there is any area where at least something is not allowed.
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