Spot on Bill!
It's also very satisfying to recce a route then find it all clicking into place in clag on race day, with the map and compass safe and snug in the bum-bag.
I always remember running the Coniston in claggy weather and using my usual line round the side of Great How Crags. I was amazed when Andy Peace joined me from the left having been on a "walkabout". We shared strides for a short (very short!) stretch then when I changed down three gears for Brim Fell he just carried on at my top speed and soon disappeared. It made for good banter in the pub later though...