Originally Posted by
Ygduf
Eh, I use the Garmin elevations, so everything I post is probably 10% high as well. Regardless, as long as you use the same measurements each time you will know how what you've done compares to your other rides.
(to be honest, the Garmin elevations at the tops/bottoms of climbs seem to be about right. I don't know if it's oversensitive on rollers, or adding cumulative ascent wackily)
Are you referring to the GTC elevations? I've found that the real time elevation total from my 305 seems to make sense, once I get things into Motion Based or Garmin Training Center then all bets are off.
In my limited experience, the errors seem to come from when GPS coverage gets sketchy, and the Edge appears to suggest that you're riding off road - check out this from my Saturday climb up Tunitas. I think that the online programs then use topo maps to calculate elevation for these erroneous routes, leading to discrepancies:
