Radar Scanner

The Radar Scanner is an unlockable Equipment item in Risk of Rain 2.

Completing the Bookworm Challenge unlocks this item.

Activating this item creates a "?" over every interactable on the map, revealing their approximate location. These marks last for ten seconds and are present for all players. Since they are all the same size, determining how far each is is sometimes difficult.

As this item reveals ALL interactables on the map, things like Legendary Chests, Rusted Longboxes, and Newt Altars can be located with ease.