The used 16' Smokercraft I bought a couple years ago came with an Eagle DF480 fish finder. It never worked great, but at least would reliably find how deep the water is. Now it can barely find bottom.

I'm pretty ignorant regarding the options out there, but does anyone have a good suggestion for a fish finder that will do the job fishing puget sound, lake washington, baker lake, etc. and won't break the bank?