+xmacs86 - 10/17/2017 1:21:37 PMThanks everyone for the useful replies.I am hoping to get skydemon to at least nearly replicate what i get with my wizz wheel. I do appreciate that TAS varies slightly with temp and altitude, but notwithstanding that i am getting very odd things on my skydemon plog.Check this image out for example (i screenshot it when planning a flight this morning). The first and final legs are flown in pretty much exactly the same place, at the same altitude, less than 20 mins apart. Yet Skydemon says the TAS on the first leg is 101, and on the second leg is 113. Presumably the reason for this is that skydemon is adding in some kind of correction because it thinks im taking off from Brighton marina. But in fact im taking off at shoreham and flying to brighton marina where i start my nav.What would be really useful would be if i could just override all of skydemons cleverness and tell it what TAS i want to use for the leg, or even better the entire flight.