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I'm planning a fishing trip to Vermilion this summer. It's been many years since I've been up there. I have the Navionics + app on my mobile devices and have been marking spots that look interesting. One of the spots I marked was a nice hump surrounded by deep water. There was a big difference between the Navionics Nautical Chart view and the Sonar Chart view. It literally disappeared on the Nautical view but showed on the Sonar View. I then ran the map "update all" and from the Sonar view now it was gone from both views with my marker out in the middle of nowhere. So I started to l