How to unlock: The quest unlocks automatically after completing The Glowing Sea main quest in the Rocky Cave (M8,1) location.
- Go to C.I.T. ruins
- Adjust to courser's radio frequency
- Use courser's radio frequency to track one of them
- Kill the courser
- Get courser's chip
Adjusting to courser's radio frequency
In order to start the quest, you must reach the C.I.T. ruins located in Cambridge, in the central part of the map. Once you reach the destination, don't enter the large CIT building. Instead, activate Pip-Boy and open the tab with radio stations. Select Courser Signal from the list of radio frequencies.
Using coursers' radio frequency to locate one of them
Notice that from now you will regularly see information about the strength of the radio signal appearing in the upper left corner of the screen. It will be helpful in finding the courser you are looking for. Your destination is the Greenetech Genetics location marked on the above picture. It is located few hundred meters east from C.I.T. ruins. Reach the large green building and find the door inside that are on the ground floor.
Finding and killing the courser
The road through the Greenetech building is quite linear. You must reach one of the highest floors. However, linear doesn't mean that it will go with no emotions. While in the building, you must be ready to face members of Gunners group (watch out especially for the enemy with a rocket launcher) and various defense turrets (some of them can be turned off by hacking into the terminals). In addition to that, watch out for the traps placed in some points (especially on long bridges). The traps have a form of laser beams and mines.
In the next part of the climbing you should use elevator to reach higher floors of the building. Your objective is to reach the room in which you will find Z2-47 synth. Conversation with him is possible, but you will not manage to solve the situation peacefully and the battle will take place anyway. You can start the duel with activation of the V.A.T.S. system, but switch to conventional battle methods when the enemy starts using camouflage. If you want to finish the battle quickly and easily, you can sneak up to the nearby stairs, pick up the Fat Man lying there and shoot the mini atomic bomb towards the mission target.
Picking the courser chip
Find the corpse of Z2-47 and pick the Courser Chip. Thanks to that, you will unlock another main quest, The Molecular Level. If you want, you can free the synth K1-98 Jenny held in the neighboring room. In order to do it, you must find the toolbox under the stairs (the ones with Fat Man) and pick the Greenetech Genetics Password from it.
Quest rewards: Experience points, new main quest (The Molecular Level).