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the only thing i can help you with is i was tought to use 10 mile markers on my wac charts as they dont change if your gs picks up or slows down ( after a gs check you use your wis wheel to work out the ete for 10 miles. i learnt to fly in a 172 6mins to ten miles then flew a baron 3mins to 10 miles , no need to change the map marking , at worst go to 20 mile markers , MILE MARKERS DONT CHANGE WITH SPEED