[UglyStick]

I have the Humminbird 570 HD DI portable (the same as 571 in NJD Bassman's link) and I can't say anything but great stuff about it. I used it for many years when I was fishing out of a Sea Eagle inflatable and now that I have my Tracker with upgraded electronics, I use it when fishing in my yak. I did a lot of research when I was buying a portable unit and am 100% happy I got that unit. Great features, very accurate, easy to learn, has down imaging, compact, has its own battery and case, etc, etc, etc...