Switches on the gps
Waits for a proper fix
Waits for the next fix
Works out the distance between 2 fixes and the next and the next.
If the GPS is good and stationery the distance between two fixes should be zero. A bad or inaccurate GPS might have as much as 20m between 2 stationery fixes.
Leave it running a while and it will show you the average and the max.
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