Alright, so I've been using an Edge 705 (purchased from the great folks at Geoman) for almost three months now. Loving every minute of it, but something odd has begun to develop.
It seemed to work flawlessly for at least the first 45 days or so. Then, I would notice occasional erratic behavior with the live speed output and the max speed when plugged into my computer (I'd like to think I'm fast, but I'm pretty sure I haven't hit 74 mph on singletrack, at least not yet). No big deal, I figured it was attributed to the leaves coming out on the trees and thereby giving me momentary interruptions in coverage.
Well, the problem is getting exponentially worse. Today was terrible. I did a loop I ride two or three times each week at lunch time. The loop is 8.9 miles long and my typical average speed is anywhere from 9 - 10 mph depending on trail conditions & how I feel. Today though, the GPS told me I had only completed something like 5.6 miles and that my average speed was in the upper 6 mph range. I'm certain it's incorrect as I rode the exact same route I usually do and completed it within 2 minutes of my better times for that route.
Interestingly, the cadence, heart rate, time, calories burned, and even elevation numbers all seem reasonable and correct. It's just the speed and distance functions that are off. I've seen sporadic speed results on a number of different rides recently, but this is the first time I've noticed the distance being totally incorrect. Something else that's odd - the map (using Ascent or the Garmin software) of my route looks correct, but the numbers don't add up.
So, any ideas? I can readily email the TCX files to anyone if they would help to unravel the mystery.
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Thread: Garmin 705 going wonky