I have the 47 3D and it's not all it's cracked up to be. Especially for the price. I bought it mainly for the 3D capability, which honestly does work well for looking at the bottom contour, finding ledges, holes, etc. I have the GPS and WeatherSense add on as well, and I haven't found either of them really useful either. The GPS is great for finding spots on large bodies of water, and since I fish the lower Chesapeake Bay a lot, it does come in handy there, but as far as river fishing I keep all my honey holes in my head, so I don't need it there. The WeatherSense tells you about the barometric pressure and does trending, so in that respect some might find it useful, but I never use it. Personally, I plan to replace my unit with a Garmin color unit and plan on using an Airmar replacement transducer. Some guys swear they're able to track things as small as a jig with that setup. Overall, if you're just going to use it as a depth finder and for indentifying bottom contours, it's does that well, but I think there are better options out there that will provide better results. The 3D functionality is nice, but definitely not a must have.
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