Consisting of the four sections (Okehampton, Ashburton, Tavistock and Plymouth). If it all goes wrong for you or someone else this is who needs to be called. Ring 999 and ask for mountain rescue.
The whole of DRG consists of volunteers prepared to come find and help off the moor anyone who needs it 365 days a year!
I have the pleasure of having photographed them for work and have known several of them for years (mainly via the day job) and have to register my complete respect for the service they provide. http://www.dartmoor-rescue.org/