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Show Profile  Michael Posted: 3 June 2019, 7:01 PM  
A good summary Rolf. Could I add that (apart from the trickiness of control sites and possible influence of buildings and trees on GPS reception) there is the simple influence of map SCALE.

A rough assessment of cellphone wrist and handheld GPS accuracy is "5-10m with occasional flights of fancy out to 50m". The tramper with a 1:50,000 map will not see much error simply because 5-10m is less than the thickness of a track line. The orienteer with a 1:10,000 map who goes up and down the same track will see the GPS traces vary by 1mm (or 2 if they are are unlucky and the errors are opposite). The sprint orienteer with a 1:4,000 map could see the GPS traces vary by 2.5mm or even 5. (Hope I've got the decimal point in the right place but nevertheless think about the principle:-))




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