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Fifty Plus (50+) Share the victories, challenges, successes and special concerns of bicyclists 50 and older. Especially useful for those entering or reentering bicycling.

DnvrFox has some stats - no kidding - Check for yourself

Old 03-21-12, 09:21 PM
  #26  
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I find the elevation stats on such programs to be the most flaky. There are several for the Android phones. I also have found a given program seems to work more accurately with some phones than with others. Some programs have settings about how often the position is refreshed. Faster refreshing improves the accuracy though it eats more battery.

The best of them I have tried is Sportstracker from www.sportstracklive.com (there is another named Sports tracker from another source which is a different program though not bad). Others like Endomondo, Allsport GPS, and runTastic (which does more than running) seem to work pretty well on most phones. Give all of them a try and see which you like best.
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Old 03-24-12, 09:13 AM
  #27  
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You'll always see a difference in distance measurements between anything with a GPS and a bike computer because of a combination of sampling errors in the GPS and the fact that a bike computer measures distance by revolutions of the wheel. As an extreme example, ride around in really tight circles in parking lot for a while. Your GPS may show that you haven't gone anywhere (depending on the resolution) and your bike computer will show whatever distance the wheel has gone. A higher sampling frequency will reduce the errors but like esldude says, it will eat your battery up a lot faster.

Any differences in altitude are because some bike computers have a barometric altimeter and others use GPS satellite measurements. Again the sampling frequency will also account for some more differences. As I understand it, the ones with barometric altimeters are more accurate.

The first time I started using my Garmin Forerunner I wondered about the differences in measurements as well until the engineering part of my brain kicked in and I started thinking about it for a minute or two.
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Old 03-24-12, 07:22 PM
  #28  
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Don't forget the error in the GPS built in by the government. It is down to almost nothing but still few meters, not sure what it is.

Bill
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