This is WAY too much information for me. I use my GPS (low-end Garmin, I forget the model) very occasionally on mountain bike trips--I live near the Tahoe National Forest and you can still get lost in there sometimes. On the roadie, I much prefer a big-scale AAA map and a basic computer, just time, speed and distance. Dunno why everybody's griping about calibration, which is a one-time deal that takes about a minute, and I've never seen a use for a cadence function. If you can't tell how fast you're pedaling, you really need to pay more attention.