Subdetection Unit is a Specialty material (item) in Genshin Impact 5.7. Guide includes locations, how to get, map, location, farm routes, & characters.
Detection units produced by Fontaine Research Institute using new models of artificed components. Its original purpose was monitoring all kinds of environmental data.
How To Get Subdetection Unit & Location Map
Lack materials in your world? Search for people who would like to help in this: Item Exchange Thread
How To Get
Found in the wild in Fontaine
Subdetection Unit Locations
Subdetection Unit Can Be Found At Liffey Region & Fontaine Research Area
Subdetection Units can only be found in the Northern Region of Fontaine, Liffey Region and Fontaine Research Institute Region. Several clusters of these units are scattered across the area, with some locked behind World Quests. Most of the easy to access Subdetection Units can be collected around the New Fontaine Research Institute and the Waypoint near Experimental Field Generator.
Each unit yields 1 Subdetection Unit.
To maximize your Subdetection Unit gathering, consider these strategies:
Utilize Farming Route for Subdetection Unit
Use Characters with Exploration Utility Passive
Subdetection Unit respawns every 48 hours
Consider visiting other player's World
Utilize Farming Route for Subdetection Unit
Subdetection Units are plentiful along shorelines and within the waters of the Northern Region in Fontaine, but they are not in a specific location. Going to the gathering areas one-by-one to harvest them may be inefficient. It is recommended to utilize the Farming Route for a faster and more efficient farming.
For easier Farming, it is recommended to use characters that reveals the location of Specialties in Fontaine. By just putting them in your team, the locations of Subdetection Units will be shown in your mini-map which makes farming for the item easier.
The character passive that shows specialties in the mini-map shows all of the specialties in the location. This is not limited to Subdetection Units.
Subdetection Unit Respawns every 48 Hours
After getting the Subdetection Units in your world, they will only respawn after 48 hours or 2 Server Time resets after.
Consider Visiting other Player's World
You can also get Subdetection Units by visiting other player's world. This is great for getting large amount of Subdetection Unit. Make sure to chat your intentions to the World owner first! You can also use the Item Exchange Thread below:
Your feedbacks will be checked by our staffs and will be attended to accordingly. Please be advised that we may not reply to every individual feedbacks.
You missed 2 in the building in between the Experimental Feild Genorator boss and the broken bridge with another 2
Anonymous4
And finally, during the first route of the South region of the New Institute side, it says pass through the broken building. Don't pass through but instead climb on top. You will find 2 more units.
Anonymous3
One more is following the ones near the s**** south of the New Fontaine Research Institute. Follow the s**** from the second location until you reach ruins with a hydrogana puzzle and three switches. Destroy the pots near the water and below one there will be another unit, making it 70.
Anonymous2
Another one that was missed is the near the Shrine of Depth. When you head up the slope from the ruins, make a short detour to the left where the tower is. To the left of it, you'll find one near a pile of debris.
Anonymous1
This guide isn't entirely complete. If you go up Mont Esus East you will find 2 near the entrance to the tower and two behind the tower on a small ledge. So at least 4 more than the guide suggests, unless I have missed them while reading through it.
Skirk
From the waypoint, head southwest to the waterfalls.
At the top of the waterfall, head to the building ruins.
Inside the ruins, there is a shelf you can find one Subdetection Unit.
Inside the ruins, at east get one Subdetection unit close to the green box.
From the cliff, glide down and head to the Flame torch.
Around the Flame torch, get 2 Subdetection Unit.
Head north from the Flame Torch, head to the small island.
At the small island, get one. It is close to the gimmick.
At the south of Statue of Seven, get 2 Subdetection Unit.
At the corner wall, get one Subdetection Unit.
Follow the path to the left and get one.
From the waypoint, head northwest to the gear.
Head to the gear and get one Subdetection Unit.
Head to the tree southwest to the gear entangled with roots.
At the location with gears, get one. 
To the front entrance, head to the gear and get one.
From the waypoint, head northeast to the mountain.
Halfway, you will find a gear. Run towards it.
At the gear, you can get one.
Head north to the ruins.
From the ruins, go to the gear by the entrance to get one piece.
From Waypoint, head southeast to the goal.
Go to the area with a Pneuma orb and gimmicks.
Get one Subdetection unit right behind the wooden boxes.
Head to the slope southeast.
At the branching road, follow the path south to the small rubble.
Behind the rubble, you can get one Subdetection Unit.
Head to the cliff north to find a building. Follow that building.
At the pillar beside the stairs, get one.
After climbing, you will find one at the corner.
Go to the ladder right beside the entrance and get 2 Subdetection Unit.
After climbing the ladder, head right to get one.
From the waypoint, head south to the broken bridge.
By the tip of the broken bridge, get one.
Head to the ruins found by the bridge.
Head behind the ruins.
From behind the ruins, head to the trees and get one.
Warp and head to the wall that can be seen.
Climb the broken wall to the second level of the building.
After climbing, climb a broken wall once again.
At the edge of the pillar, get one Subdivision Device.
From southeast, head to the collapse handrail then head down.
After going down, get one Subdivision Units. 
Right beside the gimmick, jump outside the handrail.
Jump and head to the building and find 2 Subdivision Units.
At the east, follow the path to the right then move towards the wooden boxes.
Get 2 Subdetection Unit around the wooden boxes.
From the waypoint, head to New Fontaine Institute following the North Exit.
From the exit, check left to get one Subdetection Unit.
To the Northeast Cliff, head to the ruins.
Below the ruins, get 2 Subdetection Unit. 
From the edge of the cliff Northeast, and head to the Shrine Of The Depths.
Right in front of the Shrine Of Depths, there is a cart. You can get one Subdetection Unit there.
From the bottom of the south cliff, head to the Ruins that you can see.
To the ruin side, head to the gear.
Above the gear get one Subdetection Unit.
From the waypoint, head south to the wooden crates.
On top of the box, get one Subdetection Unit.
At the boat ruins, get 2 Subdetection Unit. (Top of the tree crate and tip of the boat.)
At south of Boat Ruins, get the Subdetection Unit on top of wooden planks.
From Waypoint, head north to the building
From the entrance of the building, enter the room and get 2 Subdetection Unit. 
From the waypoint, head west then head outside the building.
Get 2 at the area. 
After going down, head east to get 2 pieces. 
After climbing the stairs, climb the landing.
Head west to the building that can be seen.
Pass through the building.
After exiting the building, head to the stone mountain on the right side.
Pass by the broken wall.
Pass the wall, inside the building, you can get 2 Subdivision Unit by the gears.
From the waypoint, head to the broken bridge then glide at the bridge with a bit of grass growing.
At the broken bridge, get 2 Subdetection Unit.
Head north to the area with collapsed floor.
At the collapsed floor get 1 Subdetection Unit.
From the waypoint, head south. Head between the Tree and the ruins.
Dive in the water
After diving, head down then follow the underwater tunnel.
After passing by the tunnel, follow the main road.
After following the path, head to the big room.
At the big room, go right to the ornament.
By the Ornament, get 2 Subdetection Units. 
Head north to right before the broken bridge.
At the broken bridge, you can see an ornament to the lower left.
Get 2 Subdetection Unit right in front of the Ornaments.
Head east then towards then follow the wall on the right.
Head to the entrance you get to by following the wall. 
Head inside the room then jump down to the hole.
After going down, head to the room then follow the path.
After entering the room, head down the stairs. then head left.
At the small house, you can get 2 Subdetection Unit.
Head to the area northeast to the pillars on the right side.
Right at the bottom of the pillar, get one Subdetection Unit.
At the New Fontaine Research Institute West Waypoint, head Northeast. Afterwards head to the cave.
At the end, head down then look back.
Get one piece from behind then head southeast.
Get one Subdetection Unit southeast, then head down to the lift pointed out in the photo.
Head down the lift to get one piece of Subdetection Unit then follow the path.
At the fork in the road, follow the arrow in the photo.
Follow the path
Go down at the end
Follow the arrow in the photo and ride the Lift
Drop down the lift and get one Subdetection Unit then follow the path.
Ride the wind then head above.
Head south pointed by the arrow in the image.
Once you leave the area with a huge space, drop down the hole.
Get one unit at the area where you dropped then head back.
After climbing up, head east to the area pointed out by the arrow.
You can get one unit after.
Follow the direction in the photo.
At the fork Road, head to the Elevator.
Leave the Elevator and follow the path then head Northeast.
Climb to get one Subdetection Unit.
From the waypoint, head west.
At the one way, get 2 pieces.
