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Geographical precision compared

Precision UK Ordnance Survey Eastings and Northings Grid Reference Degrees Decimal Degrees
Data from Wikipedia Stack Exchange
111km 1 0 decimal places
11.1km 0.1 1 decimal place
1.1km 2 digits each/4 digits total
1km square
0.01 2 decimal places
111m 3 digits each/6 digits total
100m square
0.001 3 decimal places
11.1m 4 digits each/8 digits total
10m square
0.0001 4 decimal places
1.1m 5 digits each/10 digits total
1m square
0.00001 5 decimaal places
11cm 6 digits each/12 digits total
10cm square
0.000001 6 decimal places
1.11cm 7 digits each/14 digits total
1cm square
0.0000001 7 decimal places
1.11mm 8 digits each/16 digits total
1mm square
0.00000001 8 decimal places

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