There are two reasons for this:
Plotting tools do not display if a map scale greater than 1:30000 is selected.
If you wish to plot or measure from the Ordnance Survey layer supplied by Bing you will need to activate the full Bing mapping module. (Users with the ability to import field boundaries from GPS equipment may find this option more useful for their mapping needs).The upgrade from Bing light access carries a minimal licensing cost: for more information please contact Farmplan on 01594 545022.