I am not really up on all of the technical stuff on the Garmin 405, as you know, I am a techno-dunce. The screen is small, for sure. I know he uploads the profile to the PC sometimes and it does work; but all of that stuff is mysterious to me. I haven't heard any loud swearing when he is using it. We mostly use it for the "bread crumb" feature, because even though I claim to have a good sense of direction, when I get in the woods, I am totally lost. So, it gets used for hiking and mountain biking mostly, or long bike rides where we want to know the elevation. Our friend who we ride with has the same model and he uses it on every ride, hike, x country ski. We depend on him for full profiles of all of our escapades.