Originally Posted by Anicius

I agree. What I do with mileage and GPS tracks is a hobby pursuit,
Another point I will mention regarding the Cateye. I often have inadvertently zeroed out my mileage by holding down the button while leaning over or handling the bike. The Strada has a second circumference setting and mileage reading that stays put if you zero out the main reading., It's intended to allow a wheel swap or use of the Cateye on two different bikes, but I rely on it when I accidently kill the main display, A second mileage reading also lets me independently check mileage between points during a ride. The Cateye, on a multiday trip, can be used to track daily mileage without having to mess with the GPS. There are some likely variations with the Cateye mileage such as tire pressure and riding surface, Changing tires will probably throw it off. Using mile markers on a bike path to calibrate wheel circumference is pretty unreliable if you're shooting for accuracy. A realignment that is longer than the original path will throw off mile markers that follow it, and markers are sometimes planted elsewhere when the surface at the actual mileage point is inhospital to a physical marker. But I do think that a properly calibrated wheel circumference may be a tad bit more accurate than GPS, at least for day rides. The problem is the calibration,
For me, the main point of the GPS is to display and record tracks and terrain. The Garmin I have can use rechargeable NI-MH batteries, a savings over the long haul. It's survived falls at speed from the bike, is waterproof, and uses buttons rather than a touch screen, which I like,
Happy riding!