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the 820 explore has a touch screen, is the most basic ('dumbed down') and is the cheaper of the two. so it came came closest to my wish for just a no-nonsense navigation and tracking device. it's still offering way more than what I could ever need though.
received it a couple of days ago, struggled to get it connected, but that turned out to be a faulty usb connector cable (argh). maybe I'll post some comments here after I've used it for a while.
read reviews for 5 hours, ordered the 820 explore