Cool Navigation Tip I learned at a refresher nav course: use some twigs, straight ones please, to put on your map to check when at a fork in the trail.
Align your map and compass north and in the direction of the fork:. Put the twigs onto the fork on the map to emphasize the angle. Visually check how the twig fork matches what you see in front of you. Pick the proper fork.
I’ve used this tip already twice since learning it, to figure out unmarked trail forks.