Ghorm the Devourer Scanner大喰らいのゴームのスキャナー

Scans the world for Ghorm the Devourer. Consumed on successful scan.
In-game description

How to use Ghorm the Devourer Scanner

Ghorm the Devourer Scanner is a scanner that marks where Ghorm the Devourer is on your map. Use it when you cannot find the boss.

Put Ghorm the Devourer Scanner in your hotbar, select it and use it (right-click). Using it takes 2 seconds.
If the scan succeeds, the location of Ghorm the Devourer is marked on your map and Ghorm the Devourer Scanner is used up (it is only consumed on a successful scan).
Follow the marker on the map.

The marker stays on the map until Ghorm the Devourer is defeated.

Calculated and summarized by this site from the game data (1.3.0.6).

It is used up.
The marker stays on the map until Ghorm the Devourer is defeated, and it follows Ghorm as it moves.

These notes cover behavior that the game files do not show directly. They are based on facts from the Core Keeper Wiki (Fandom) page "Ghorm the Devourer Scanner" (CC BY-SA 3.0), rewritten in this site's own words.

Material	Amount	How to get the material
Ancient Gemstone	× 3	Fishing Boss Enemy Chest Breakable
Mechanical Part	× 3	Boss Enemy Chest Digging Breakable