If you really must use a computer there is a cheap program called NAV BOX, does it all for you. However, if you can't do it in your head, the computer is not much use when you are in the air and discvover the Met man tells lies.
Simple rules of thumb work, Work out max drift (2/3 WS at 90 Kts)Apply as: 0-30 degrees off= 1/3; 30-60 =2/3; 60-90 =All.
For Groundspeed use Max WC = Wind Speed Apply as: TAS +/- From 0-30 degrees off = All. 30-60 = 2/3; 60 -90 degrees = 1/3.
You should be able to calculate the wind in the air on your first leg, and then apply it on the next leg.
PPLs get too bogged down with the Prayer Wheel, the RAF hardly use it!.
[ 18 November 2001: Message edited by: Noggin ]