The green mass shown on geocaching.com by Google is not very accurate so have decided to go with the OS definition instead – there are quite a few differences!
Decided that the centre of Dartmoor was near Postbridge and that a circle of radius 12.6 miles would encompass all of the National Park. But….. it also encompasses a huge area which is not in the National Park – help!!
Have created a pocket query which returns 303 caches placed in 2011, but sooooooo many of them are not in the park! How to proceed from here????? 
