A Calibration Data USB is a key item used to activate Refractors in the Aether Storm to spawn the Greylorm boss in Call of Duty: Modern Warfare 3 (MW3) Zombies. Learn all the locations of where to get a Calibration Data USB and what to do with them!

Calibration Data USB Map

Calibration Data USB Easter Egg

Game8 Notice	The locations of the 4 Calibration USBs will be random for each game session. You will first need to head to the Orlov Military Base to find out where they spawned for your current match.

How to Get Calibration Data USB

1. Refer to the Map at Orlov Military Base
2. Activate the Towers to Receive a USB

Refer to the Map at Orlov Military Base

Map Location
In-game View

Proceed to the building northeast of Orlov Military Base and go up to the second floor to find a map on the wall.

You'll find 4 pictures posted beside the map itself showing the locations of the Calibration Data USBs around Urzikstan. Compare these locations with your own Tac-Map and head over there once you've confirmed a location.

Keep in mind that the locations of the USB sticks are random and will change each time you hop into a new game session.

Activate the Towers to Receive a USB

Activate the console at the bottom of the Tower to receive a Calibration Data USB. Activating the console will take some time, so be sure you've cleared the area of zombies or have a squadmate watching your back.

It's important to note that you won't be able to exfil with these Calibration Data USBs and you'll lose all of them should you die in-game. However, if you have the Tombstone perk, you can retrieve them again in the next game!

All Calibration Data USB Locations

Map Clue	Actual Map Location
	North of Levin Resort
	South of Shahin Manor
	Southeast of Old Town
	East of Orlov Military Base
	Center of Popov Power
	North of Zaravan City
	Southeast of Seaport District
	Center of Hadiqa Farms
	Northwest of Old Town

NOTE: This is a list of all possible Calibration Data USB locations. The 4 locations that spawn during your Zombies match will depend on what you find when you visit the Orlov Military Base.

Location 1: North of Levin Resort

Map Location
In-game View

North of Levin Resort on Grid C1. The Tower containing the USB will be right beside a grand staircase and a Deadbolt Turret.

Location 2: South of Shahin Manor

Map Location
In-game View

South of Shahin Manor on Grid H8. The USB tower is located on the second floor of a boathouse.

Location 3: Southeast of Old Town

Map Location
In-game View

Southeast of Old Town on Grid G4. You can find the USB tower at the center of a parking lot.

Location 4: East of Orlov Military Base

Map Location
In-game View

East of Orlov Military Base on Grid I2. You'll find the USB tower right next to a Silo and a building with satellite dishes on its roof.

Location 5: Center of Popov Power

Map Location
In-game View

The USB Tower is located on the roof of the building at the Center of Popov Power on Grid F3.

Location 6: North of Zaravan City

Map Location
In-game View

Head to the rooftop level of the building (marked on the image), just north of Zaravan City on Grid D6 to locate the USB tower.

Location 7: Southeast of Seaport District

Map Location
In-game View

Southeast of Seaport District on Grid C4. The USB tower will be right beside a fountain of a park.

Location 8: Center of Hadiqa Farms

Map Location
In-game View

Go to the center of Hadiqa Farms on Grid I5 and you'll find the USB tower right next to a greenhouse.

Location 9: Northwest of Old Town

Map Location
In-game View

Northwest of Old Town in the Red Zone. The USB tower will be near a ledge on the roof of the building.

What to Do with Calibration Data USB

Activate Refractors at the Aether Storm to Spawn Greylorm

After obtaining all four Calibration Data USB sticks, proceed to the Aether Storm and activate the four Refractors to spawn the Greylorm. Take note that you will not be able to activate these until the Aether Storm begins to expand at the end of the game session.

There are 3 set locations for where the Refractors can appear. Refractors are found where there are two ammo caches right beside each other on the map, usually near the Aether Storm.

All Refractor Locations

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Zombies Mode Walkthrough and Guide

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