In Assassin's Creed Valhalla you may come across Standing Stones which will give you additional points. On this page of our guide, you will find out where to find standing stones in the Vinland region.
You will find the cairn in the middle of the map, right next to the synchronization point.
In order to find the correct pattern, you must first get rid of the rocks that interfere with the view. Just move them so that they do not stand in your way.
Then jump on the highest stone in the area and look towards the north. In this way, you will notice the pattern that was created on the rocks.