If you multiply the forcast wind by 60 then divide this by your T.A.S the answer will be your MAX DRIFT. i.e. 20kts x 60 = 1200 / 120kts T.A.S. =10 degrees max drift. You can then use the watch analogy to determine how this will effect you in flight.If the wind is at ninety degrees to your longitudinal axis you will have full drift. You can expect full drift down to an angle of 60 degrees. This is where the watch comes in. 45minuits is 3/4 way round your watch,if you have a wind angle of 45 degrees then use 3/4 of the MAX DRIFT. For a wind angle of 30 degrees you would use 1/2 the MAX DRIFT etc. Hope this helps.
