Outbound Are you looking for different landmarks on the map? One of them is a large windmill. However, once you reach it, you will notice that it is not operational. This is because you have to complete a puzzle involving some gears to make it work again.
Doing so unlocks a round 'n round achievement or trophy. Also, it allows you to reach the terminal inside the windmill, meaning you can get a new blueprint. Here is a full explanation on how to complete the gear puzzle.
To solve the gear puzzle, you Need to have 20 scrap metal. So, make sure you go around and collect some scraps before you take a trip to the windmill. You will do the most Often find some around signal towers.

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How to get to the top of the windmill
When you enter the windmill, you'll see a door downstairs with a red light above it. Ignore it for now Walk up the stairs.
At the top of the stairs, you can Find the two levers. Use these for Roll the wooden platform above you.
That platform is divided into three parts. One has a collection of boxes, another has some shelving and a third has a ladder.
Turn it around enough so that A collection of boxes is directly above the two levers.
After that Climb the stairs get up there
next, Climb the boxes and look up to see a green switch. Flip it over Bring down another ladder. It may fall after the shelves, so go down to pull the lever to move them out of the way.
How to fix a windmill
Climb the new ladder who reach the attic. Up here, you can Find some big gears and pull the brake lever.
go up to A large broken cogwheel and Use your scrap metal to fix it.
Once this is determined, Pull the lever. This activates the windmill, meaning you're done Gear puzzle complete.

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