A friend uses a Lowrance Elite 7-HDI and it works really well. You have to get the $60 mapping card from PCI Race Radios to get the detailed maps. I'm just copying what he sent me when I asked him about it, I personally know nothing more about it since I haven't sprung for one yet.
We use the in side by sides. Lowrance HDS or Simrad go series. Whatever one budget calls for. Look up standard mapping. It's like a google earth image. So so on zooming in. Overall great to have. Or you could just get a really good mount for your phone and use google maps if service permits.
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