Hi Lyle, I was walking very short legs between getting new targets and using a 1:50,000 map, so I just kept a mental note. I was coming up a gully out of the Loch Avon Basin (Pinnacle Gully beside the Shelter Stone Crag) so I knew my starting point and was able to take one single bearing on the summit, with no obstacles on the way and, given the lack of fresh snowfall and wind for several days, felt able to use the usual footprint highway from Cairngorm as a handrail to aim off at. Given the terrain and the weather, I don't suppose the task was too serious, but having walked through a lot worse, it's a tactic I'd feel happy about using when it does get serious.