Well-Stacked Cairns

Well-Stacked Cairns is a companion perk in the Fallout: New Vegas add-on Honest Hearts gained while Follows-Chalk is a companion.

Effects
When Follows-Chalk is in the Courier's party, reaching any summit in Zion (such as the ranger substations) will reveal all nearby map markers and inspire a heightened sense of awareness (Perception +3) for three minutes. The trigger area for this perk is usually close to the fast travel point.

Locations
There are six summits that trigger this perk listed below with the map markers they reveal:

Behind the scenes
A cairn is a man-made pile of stones or rocks used for navigational landmarks. They are commonly found at the summits of mountains.