Thanks everyone for all your advice. I've settled on wind down. I did my first navex today and all the calculations worked out - it was very blustery today, and yet it all worked out. Amazing!
My instructor gave one further piece of advice: instead of using a pencil, which is relatively thick, use a water-soluble fine-tip pen and just put a dot on the W/V mark. It's a lot easier to read and much more precise. Success!
