I use fresh water on an Elete 5. For all depths. Best thing to is go out in the afternoon and try em all. I know nothing about the HDI part of that equation.


Look up Dr Sonar on the web. Give him a call and he will recommend one of his dvd's for what you want to do. He knows more then anybody I have ever talked to at Lowrance or otherwise.

He is a scientist and uses an underwater camera side-by-side with his graph to verify what he is looking at. He put a couple of my friends quickly sleep one night when I showed them a video. You know who you are. Lol