Head to the building south of Lombard St itself then fly your quadcopter while in NetHack view to see the exact location of the hackable object containing the Key Data. It’s found under a wooden platform on the rooftop of the marked building.
Head to the marked building in Chinatown and go to the alley at the back of the building. There’s a ladder there that you can use to reach the rooftop. Hack the CCT there, then follow the data flow using your quadcopter and open the vent leading to the hackable object containing the key data.
This is located inside a small, restricted residential backyard area directly south of the Coit Tower itself. There are only a few gang members guarding the area and there are multiple entries to the backyard, making it quite easy to infiltrate even with just your jumper alone.
First, find the underground parking entrance in the eastern side of the Embarcadero Center. Next, find the closed garage beside a ctOS van. If you open the garage door, you’ll find a small restricted area with three Uemeni security personnel guarding the room. The data container is found in the middle of the room between the two vans. You can send your jumper then use the distraction hack to give you enough window to dash inside and recover the data container. A well-placed ESD or explosive in the middle of the room should also be enough to get rid of the guards.
This is located on top of the Ferry Building’s tower. You simply need to fly your quadcopter to get in range and hack it remotely.
This key data is found in a locked shed at the back of the fort. The electronic door there can only be opened by completing a complex network bypass puzzle. You’ll need the quadcopter to move around the beams and supports of the bridge where the nodes are located. Refer to the video below for the solution of the network bypass. After completing the data flow, you can now unlock the electronic door and collect the Key Data.