I have that unit on my boat. I am still learning all the things it can do. The unit is better than I am for sure. As far as marking spots and returning and also locating things. I entered 35 offshore reefs and wrecks that are public numbers on FWC website. When I clear the inlet and choose the waypoint it will take you to it and can easily see the wrecks, sunkin bridges or reef ledges, I am looking for. Depths of these range from 25' to 130'. Have also found other areas that are not public numbers and marked them and can return with ease. I have always had handheld or basic cheap depthfinders prior to this unit, so I would say it is very user friendly as I am no electronics wizard. I bought Lowrance because i knew I was getting a Motor Guide XI5 and if I ever wanted to link it would vs the Hummingbird that would not. I have not linked them to date.