I have an Navman S 80 upgraded to this from ICN635. How stupid? Nothing but problems. No help from Navman, keeps turning off, cannot put you back on track, keeps displaying "can't calculate a route back on track", screen freezes, non-glare screen (what a joke) near impossible to see in sunlight or bright day, touch screen slow to respond, preloaded speed cameras do not seem to be in right place on display, and so it goes on.
Hope this assists other people thinking about upgrading or buying think twice. I had no trouble with ICN 635. Very good but took option of upgrading to S80 and to update maps.