I have not used the lowrance elite 5 hdi but I do have a helix 5 SI. I am sure the helix 5 di has most of the same features without the side scan. I use mine on a kayak and really like the single button to mark a location. Also if you have a SD card the single button will also start a screen capture if you would like to go back and review it.
I have also had better luck with hummingbird support over Lowrance support. Just one persons opinion.
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