Whitchurch Common is on the western edge of Dartmoor – it is on the top of the hill before the land plunges down to Tavistock and beyond. There is a large car park on the Common below Cox Tor and it contains a plaque which details the panorama in front of you.
To help you I will transcribe the words / locations. From left to right (or if you prefer from south to north) it reads:-
Staddon Heights, Plymouth Hoe, Mount Edgecumbe, Roborough Down, Plaster Down, Tamar Bridge, Saltash, Whitchurch Common, Tamar Valley, Whitchurch Down, (Lands End 80 miles), Gunnislake, (Tamar Valley), Kit Hill, Caradon Hill, Kilmar Tor, Tavistock, Brown Willy, Launceston, Ramsdown, Brent Tor.
Quite a view and worth a visit if your are in the area