Drift isn't as bad in the air as one might think. At least if you can see the ground. Just line up two distant landmarks along your course. If the close one moves to the right turn right to stop the drift. Then turn right again to correct course and then turn left to the heading that stopped the drift.

The same works on the ground with landmarks surprisingly far away. It will correct a tendency to always go right or left around obstacles.

As you get near the first landmark, select a third to continue the process.

You can use this in the "find the truck" scenario. On the way out pick two high landmarks to line up on the way back. Be sure to write down the bearing. If you are planning a loop, find a bearing on two obstacles that will line up at the end of the loop.

This stuff takes a lot of practice, but that's part of the fun.