pilotho,
Do you know why you find yourself off track for in the first place? Does it happen frequently?
Assuming that you have plotted your course correctly, then perhaps you need to identify some additional waypoints to check your timings against? I know it might seem a bit of a pain but it could help you understand where you might be going wrong?
If I'm flying in an area that I'm new to, I note as much as I can off my chart ie road junctions, railway tracks, lakes, power lines, villages/towns and any feature that I think may help. I check my timings against them and recalculate as required.
If it's any help, I managed to get completely confused about my exact location on a refresher flight before I renewed my rating last year. The worst thing was - I was only 20nm miles away from the town I have lived in all my life!!!