In order to learn about the German shipments you must get to the next building located in the north (M4,9). You should go from the armory to the ground level. Then, behind the building that is facing the water, you can see a narrow passage. By using it you can get near the ships. Go this way to the building, which is pointed by the radar, and hide among the chests. If you are noticed, shoot the hook that is far away from you or throw a grenade somewhere to mislead your enemy.
There are three ways that leads to the building: main doors in front of which there is the biggest number of enemies (you can enter from the north side of the building and go down the pipes landing just before the doors); window from the west side that faces the road; a part of the wall from the north that can be blown up (but, as you may guess, it will cause a lot of noise).
The easiest way to get into the building is to use the window that faces the road, you get there by going around the building from the north. But ultimately, you enter the building only for a brief moment - to take the object laying on the table right in front of the main entrance. After taking it, use the window to get on the road.