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Inconsistent between 2 Garmin Etrex20 GPS

Former Member
Former Member
A group of us go out walking in the countryside in the UK. Two of us now have Garmin Etrex 20 and use them to capture the walk and the distance. However we never seem to agree on the distance measured by the Garmins. I would expect there could be a small difference. But todays walk My GPS: 8.99 miles. Mike's GPS: 8.59 miles Difference 4.6%. I would have thought with satellite GPS error would be smaller say less than 1%. Both GPS are on the default settings as purchased. (I believe there are some settings that might effect the distance measured). Any ideas why we should get such a large difference. We both walked exactly the same route, give or take a few feet.