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Hi, I apologize if this question highlights my ignorance: I have a Lowrance elite 3x. When I set the depth detection to automatic, it seems to almost always want to show a "double bottom" or "double echo". In other words, if I'm in 9 ft. of water, the fish finder will set itself to 20 ft. and display one bottom at 9 ft. and a second identical bottom at about 18 ft. Is there a reason for this? Or am I not understanding the display correctly? Thanks, Tom