Track correction when flying


I am getting ready to do my PPL exam and got another instructor. We done a few diversions and found ourself off track. He said to me the best way he teaches to get back on track is to estimate the number of miles off track and then fly a 40degree correction for the number of miles off track and this is a good rule of thumb. I forgot to ask about what this would do to the ETA?
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☠ MASQ ☠Commented:
Standard Closing Angle (the correction method you're describing) adds about a third to the flight time for the part that it's applied to  (so a 30 minute flight corrected with SCA will be 40 minutes)  I can probably look out the math for it but the bit I can remember is it's something to do with COS 40° being about 0.75.  Google will probably explain it better though :)

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