Got lost a couple of weeks ago between Wolverhampton Interstellar and Moreton-in-Marsh disused; I didn't know if Bidford glider site was a disused airfield or not (anyone know?) so when I found myself overhead a disused field I wrongly concluded I was at Bidford, going slower than planned, rather than (as was actually the case) at Honeybourne, on time but off track.
Moral of this story? You're more likely to be off on the heading (DI drift, hard to align DI to compass in turbulence, &c.) than on the timing, which relies on a fairly accurate stopwatch. Hence if you think your timing is out, check that it's not actually your heading.
Nearly got to Brize but as the nice lady there had us on radar she gently pointed out that we had CAS in our 12 o'clock; bimbled around a bit and found Rissington, and then we were fine.
Tim