This is an awkward one Joe to be honest.
Without stating the obvious like being prepared for the Moors in the first place......and letting someone know where you are going and when you expect to return.
That aside.
I think if myself and a buddy were caught out in dense fog and snow flurries and bad visibility I would suggest to my mate that we make the best shelter we can from what we have and whats around... together and stay put!!
It is never a good idea to wonder about on the moors in bad visibility.
Far better to stay
together and wait it out.........if possible.......never split up.
So many things against you on the moors because of its size and features.......for instance bogs....... one of the worst to get caught out in and often found near rivers and streams......low lying ground.
Steep falls and trip hazards are everywhere.
Moving around in bad visibility increases your chance of injury tenfold.........turning a bad situation into a dangerous and maybe life-threatening one.
Wait it out......make for high ground pick a reference point and move on from there when conditions allow.
Hopefully, you will get out or be found..........If not.....my epitaph would read....."
I messed up"