It's basically the same unit as my Elite 5DSI .... with 2d sonar function added .... which is why they call it "Hybrid Dual Image" (HDI). Personally, I don't think the added 2d sonar does much for the unit. The 5" screen is not too bad, when one function is being displayed. When two functions are being displayed, it's a bit crowded ... so I can't see where having three functions on screen would be very rewarding. I started using mine with the map/DI side by side, and that was pretty crowded, and requires some button pushing to switch from the map to the DI image in order to zoom in on either image. When I got the "update", it allowed the two images to be one over top of the other, which gave a much improved visual ... especially for the DI image, just because it stretched it out across the screen, which meant that the image lasted longer on screen than when the two images were side by side.
Like my Elite 5DSI ... the Elite 5HDI has been discontinued by Lowrance. Refurb units are still available for around $250, but only have a 6mo warranty. They've basically been replaced with the HOOK 5 Chirp/DI units.
The unit has an internal antenna .... so, you need to be aware of the fact that the distance between the unit and the transducer may factor in to your ability to to get "dead on" readings of waypoints. I have my unit at the bow and transducer on the trolling motor (<2ft apart), and haven't had much in the way of those type of problems.
If you are not familiar with Down Image, you may find the charts and discussions in this thread to be of some value : http://www.crappie.com/crappie/fishi...-chartplotter/ ... but, it's 87pgs long, so it may take a minute or two to scan through.


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