I've noticed that the the vertical up and vertical down measured on my iPhone 4 with EveryTrail has change drastically.
I did the same trip (mountain biking) on Aug 13 and Oct .
Aug 13 shows 741 up and 761 down.
http://www.everytrail.com/view_trip.php ... 558a084b3a
Oct 22 shows 3363 up and 3609 down.
http://www.everytrail.com/view_trip.php ... a4aee7da6a
It does not look like a feet versus meters issue. The only thing I know that changed was that I upgraded to iOS 5 inbetween.
Any other ideas on what could be causing this?
Thank you - Richard