Hi
I recently used my old hand held Garmin for a bit, rather than the Lowrance in the boat.
To navigate around the different screens and menus takes more button pushes on the Garmin, but it is much easier to use. How is this. Well on the Garmin you are pushing the same button repeadly - this is much easier than having to push buttons all over the place on the Lowrance. So even though you have to push less times on the Lowrance, you need to work out which button to push. Sounds easy, but in practice I find the Garmin much easier to use, particularly in a boat in rough conditions while you're travelling at speed.
I don't know if that makes sense to anyone, but if you're buying a GPS you need to test the navigation around the buttons and menus, and you're better off pushing a few buttons more often, than having to push different buttons less often. I suppose the same is true of sounders.
Regards
Whichway