I installed a ComNav 1420 this year and love it. A day's job to install with my hydraulic steering, tedious but not too technical. Holds a course better than I can. Simple unit, can be hooked up to other electronics, but I don't. After going through the archives here for info, what sold me is members from both coasts saying this is the unit that local fishermen use. There can't be any higher recommendation than that for me. About $1,400 from Defender.
"Keep putting off till tomorrow, and you'll end up with a lot of empty yesterdays" Prof. Harold Hill