My wife hates the in dash depth finder on our 89 Tracker Pro175. I hate the cheap...and I mean cheap...fish finder she got me for christmas (shhhh...dont tell her that). I would like to replace both with one reliable unit. I want it to be a good fish finder with good reliable bottom detail...be able to accurately display depth while boat is under power (my boats top speed is 42) as well as when tooling around with the trolling motor. I do not need GPS...speed reading would be nice but not necessary. suggestions and or favorites out there?