When traveling the world in Horizon Forbidden West, you might notice a small drone zipping about the sky, stopping every so often to scan the area. These are known as Survey Drones, and act as one of the collectible lines in the game.
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When near a drone, Aloy will take notice of it, and a quest to grab it will begin. You will need to scan for the drone's path and jump from a higher point to grab it, so that you can loot it while it's grounded. Here's where you can find all of the survey drones, and what you can do with them.
The first Survey Drone can be found at a Thunderjaw site, southwest of Barren Light - as indicated by the map above. Scan to highlight its path, and watch for where it stops. You'll be able to climb up onto one of the rock formations here to be able to jump onto the Survey Drone when it stops.
The Thunderjaw will continue roaming this area, circling the rocky formations. Either take it out beforehand, or wait for it to be out of sight before climbing up to the drone.
Slightly northwest of Plainsong you will find this small area covered in blight, with ruins of a fortification at the cliff edge. Circling the area will be a Survey Drone, scanning the radius covered in blight.
There will be a few machines around the location, but for the most part, they won't be a threat. To reach the Survey Drone, you will need to climb up to the wall of the fortifications nearby. Jump from the wall and grab onto the drone as it stops to bring it down, and retrieve the module.
Climbing the cliffs next to the wall will take you up to where you need to be. Inside of the fortification are some more machines, and they will act more aggressively to you once the front
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