Now I've done a bit of reading about the GPS, it seems that it's quite a common problem across several apps. Apparently the iPhone uses AGPS to get started and then the GPS proper kicks in once it has achieved full GPS lock, interestingly I did my regular route today in my car with the phone on the centre armrest and even at 30-40 mph the route was clear and correct whereas on my bike the trace would suddenly jump sideways off into a field or become very spiky maybe it has something to do with me travelling at a far slower speed or how often the software takes a positioning point.
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