Tinstaafl - you have just demonstrated what a total crock of $hit the 1:60 rule is for simple PPL VFR navigation. Something which most of the world accepted over 30 years ago.
The only trouble with the SCA method is that ageing dinosaurs can't believe that navigation can be so simple!
bookworm - now read my earlier post more carefully. After getting back on palnned track, apply only the observed drift error. No need to do both at the same time.
The 'not invented here' syndrome infests many of the gold bars on pullovers schools...