andtckrtoo
Cathlete
Anyone familiar with the Polar S625X and the SR200SD? They claim to use electronic pulses to measure each stride so you can tell how far you run. The S625X says it measure altitude as well. I've been hesitating buying the Garmin because of the GPS issue, but these say they don't use GPS. I'd love to know how they really work. The S625X measures altitude as well.