I just went through this same issue this summer.
I setup a newer boat for my dad last summer. Installed a HBird Helix 5 GPS sonar w/o down or side imaging. Bought the map chip. Never could get the map chip to read. We both had difficulty running the damn thing. This summer I gave up and installed a Lowrance Elite 5 HDI. Got a chip for it, and it works. And we can run it.

Also, Gander still has a good sale on Lowrance Elite 5 HDI.

If you familiar with Humminbird, stick with it. If your familiar with Lowrance, stick with it. The menus gave me headaches. Both are good units.

I’ve got HDS gen 2 touches on my boat, love them.