New Ordnance Survey Map Function
Jonathan Blaney, 02 February 2010
A new feature has recently been added to the historical maps on British History Online. This allows users to compare the historic map with a modern Ordnance Survey map on the same screen.
This function is available for both the 1:10560 and the 1:1,250 maps. Simply click on the "Show modern OS" button to see the modern map, and the same button will hide it again. The modern map can be dragged with the mouse to scroll.
It is already possible to view the historical map as a modern satellite image in a separate window.
Try out the new map comparison here: