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Edge 820 Distance Substantially Less Than FR945

ansonee
over 4 years ago

Could someone please tell me why when performing the same activity (mountain biking) on a FR945 and and Edge 820, the metrics computes are woefully less than the metrics the FR945 collects. Everything (average speed, distance, lap time, etc.) are all less than what the FR shows.

I'm using mountain biking as the activity for both. 

For example, my last ride showed 13.5 miles per the FR, and only 12.6 on the Edge. The FR showed avg speed as 8.7 mph, Edge showed 8.1

I have no idea what's going on, but I am ready to throw my Edge out the window. I just discovered that the battery life on this thing is abyssmal. I was using navigation and a downloaded course, and it went into standby mode after only 3 hours. That is just sad...

If anyone has seen this before or has any idea what could be going on, please feel free to repsond.

Thanks!!

  • 0 over 4 years ago

    Do you know which is more accurate between the FR945 and 820?

    There are quite a few threads on these topics but the gist is, to get the best distance/speed accuracy, use a wheel sensor and calibrate wheel circumference properly (either use auto calibration over a relatively non-tortuous track clear of obstructions that might interfere with GPS reception, or do it manually by measuring a rollout and inputting the circumference.).  A wheel sensor compensates for GPS position noise and tortuous tracks often typical of mtbing.  Most also recommend using 1 second recording rather than smart recording, though I get good results with smart recording when using a wheel sensor.

    Battery life on the 820 was never great but seemed to get markedly worse with updates after 11.2.  I tried some of the updates and reverted to 11.2 where I get ~6 hrs before a low battery alert.  IDK if the very latest revs (12.7 currently), have rectified the short battery life problem.  Since 11.2 works well for my use, I've stuck with it.

  • 0 over 4 years ago in reply to looigi

    Thanks for the reply, but it is still not clear to me how they can be so far off? They were both using GPS at the same time, both usingGPS and GLONASS, both tracking the exact same ride and the exact same duration. If one was experiencing GPS "noise", wouldn't it affect both?

    And I've seen these discrepancies not only while mountain biking, but also when road biking, and it is always the Edge that is the lesser of the two.