PS.
Just to add to the above, about 1:3 trips the wind, backstop and deer coincide to offer a safe shot and I get to take a deer. Last time out there were strong northerlys and again it was around freezing, I knew almost for sure where the deer would be, stalked in at first light and sure enough I picked up 2!
(also apologies for any errors in first post I had a 5 and 3 year old climbing on me)