Took the boat and elite dsi combo off shore yesterday, and was suitably impressed. mind you my previous fish finder was a a small black and white hummingbird and probably nearly 10 years old! No problems spotting fish on the bottom and through the water column. And I realy like the GPS combo with navionics map overlay. very easy to flick between screens, and with practice, all the menu functions will be easy to use. I had intended to play with it a lot yesterday, but it got a bit busy, with my off sider spewing the whole time, and me hooking up to lots of pesky sharks. Got a nice spotty, and a jew and a couple of squire, before I took pity on my shipmate and took him home. Mainly in 30 to 40 meters of water no problems, according to the box it will read up to 76 meters. I don't go out any further than that anyhow, and don't plan to upsize in the boat department, probably downsize eventually. cheers