1900 Ordnance Survey Map (25 inch) Home » Maps » Ordnance Survey Maps – Sherington » 1900 Ordnance Survey Map (25 inch) This is from the 25 inch (1:2,500) OS map of 1900. Other Ordnance Survey maps: 25 inch to 1 mile (1:2,500): 1882 1900 1925 6 inch to 1 mile (1:10,560): 1885 1900 1926 1952