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Dbarnett,
Those marks look like extreme snag points, rocks and underwater explosives.
Do NOT fish that area again or something bad might happen. Better yet, send me the exact location of this "dead zone" so I can warn others about it.
Seriously, those are likely fish marks you are showing. Sometimes they may look like long horizontal lines, angled lines or wiggly worms on your screen. Only under certain situations will they look like perfect little arches.
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