Thought I'd better start plotting the route

Is the Derwent Moor control (202880) really below the broad ridge, rather than on the ridge itself? Or is the grid ref wrong? Or more worryingly, can I no longer plot a grid ref properly?
http://www.streetmap.co.uk/id4.srf?X...8050&A=Y&Z=120

Other than that, it all looks quite straightforward. Ahem.