guiderock

2. A rock used as a fixed reference point in surveying or mapping.

The surveyor recorded the guiderock as a boundary marker.

3. A large stone placed at a trail junction to point travelers in the right direction.

At the fork, a guiderock pointed left toward the lake.

4. A symbolic stone in some cultures that marks a sacred or important route.

Pilgrims left small offerings beside the ancient guiderock.