I'm using Pro version on iPhone 4 and found out strange problems while hiking in mountains. When I get to places, where it is hard to get good GPS reception (ie valley in mountains and so on), accuracy of logged points is sometimes way out. I understand, that iPhone is supposed to provide accuracy level of given GPS coordinates. But is seems to me, that its sometimes providing wrong coords (up to few hundreds meters away from current position) with good accuracy info, so it is saved to my log.
When I check my trips on map, there are some points way out of trail and speed value on graph goes way out of possible walking speed. Unfortunately I already cleaned worst parts in this http://www.everytrail.com/view_trip.php?trip_id=1183567 trip, but there are still some strange parts.
EDIT One is between 3:26:42 and 3:30:25 - there should be straight line, but app logged strange circuity ending at 3:28:10. Strange thing is that there are more points logged with this inaccuracy, creating fake trail recognizable just by extreme speed (46kmph) and knowledge, that there is no such path there..
Is there any chance to avoid this errors? Maybe including some profiles for hiking/cycling/driving with speed filters and checks?
I have been using other app on iphone to track my trips (Trails), which is much more prone to these errors (check this funny log http://www.everytrail.com/view_trip.php?trip_id=1183737). I replaced it with EveryTrail, which is much better, but still logs errors and anomalies.