So I ride in South Florida where the only hills are bridges. I've written to Garmin that I think the elevation may be off on my unit, and they told me to calibrate it from a known elevation. So this morning I set it at 6ft, which is the average elevation in my area. After my ride, it logged me in at 299 feet. When I uploaded to Strava and enabled elevation correction, it had me at 0 feet.

So is it possible that the Garmin is correct, and the 4 bridges I went over accounted for the elevation, or is Strava's elevation map correct (or they don't account for bridges)? My ride from this morning (below) is after calibration. Before, my normal 60-mile loop with a few more bridges would come in over 1,500 feet of climbing.

http://connect.garmin.com/activity/286728799