Hi Dave, Dartmoor is one of the most beautiful parts of the country , for walking and exploring , and although you say you are experienced walkers , it can be the most inhospitable place ! the weather can chane in 15 minutes from glorious sunshine with clear vision to ( as a previous poster said )to not being able to see a few feet in front of you , and without the proper equipment , you can become totally disorientated, also it all looks the same and you will literally walk around in circles !
The thing that catches most out though is the terrain ! Its a lot tougher going than you can imagine , tussocks , hillocks , marshes , bogs , rivers very hard to cross , killer valleys etc .
Also , if you are planning camping on the moor itself , there is very little shelter , and very few trees to hang , oh and the wind bites like a wolf and horizontal rain that burns is interesting ! Little or no firewood ( doesn't matter you are not allowed a fire anyway )
That all coupled with , avoiding military firing ranges , the choice of whether you choose the north moor or the much softer south of the moor , oh and where to park your car so it's in one piece upon your return, shoul all make for a very safe enjoyable trip !!
Now thats the worst case scenario , if you choose your time , plan a route , now you map and compass skills , are prepared for all the things i have mentioned , you will have the trip of a lifetime !!
Depending on what exactly you want from your trip , i am more than happy to offer advice , and help with lots of the things previously mentioned in my ramblings , or i will shut up !!
All the very best with what ever you decide ..
Ivan...
PS apologies for rant , and it always seems like self promotion , but i live literally on the moor , and have safe vehicle parking , direct access to the south moor etc etc , you don't have to pay and stay at mine ( unless you want to ), more than happy to assist gratis ...