Joined: Jan 2009
Posts: 44,180
Likes: 6,418
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Are you using an Android phone, an iphone, or something else? Do you think there might be interference from some other transmitter such as a bluetooth device?
I used cyclemeter on an iphone a few years ago, and it worked well for me. A couple of years ago, I started using a Garmin Edge 200. Now for a little more than a year, I've been using ridewithgps on an iphone. ridewithgps gives me more consistent times and distances, and it has fewer GPS errors than the Garmin did. It can also locate me MUCH faster than the Garmin could.
Good elevation data isn't available yet, but I think we will see it improve soon. Basically, the GPS data adds elevation to each point in 2d space, but the data isn't so good, and no app can improve on that. I can't say why elevation on a given route would vary from one time to another. That's pretty strange.