If the predicted wind is "calm" then why would you use anything other than "calm" in your trip calculation?
As for how to calculate that on the whizz wheel - well if there is no wind then there's no need for a wind compensation calculation. GS is TAS and TH is TT. So you don't use the wheel for that part. You just need to take into account variation and deviation.
Last edited by BackPacker; 14th October 2012 at 08:24.