Not sure if this will help or not, but I was having an issue with my Lowrance Elite 4 HDI a few weeks ago, I even posted about the troubles I was having. I went down to West Marine in Newport Beach to discuss the problems that I was having with their tech guy. One of the suggestions that he made was to download the latest software update and upload that to my head unit. I did that and some of the features that I was having problems with seemed to be fixed. Not all of them, but most of them. So...., while it may or may not solve your particular problem, it might not hurt to see if you can upload the latest software update into the unit. There are YouTube videos on how to do it. Wasn't hard to do.
Good luck!
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Here fishy, fishy, fishy.....
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