There are three possible sources where you can have this mission started:
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Hack the marked antenna near Coit Tower to start this mission. Next, you have to locate and hack the two stingrays near Coit Tower. They are not protected so you can simply fly your quadcopter there and hack them. After hacking the two stingrays, the objective will be complete.
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Head to the Coit Tower itself and locate the stingray device. It’s located at the top of the tower. Unfortunately, your drone doesn’t have the range to reach it by default so you have to find a way to gain some height to extend your drone’s vertical range. Good thing is that there’s a Climbax lift by the stairs. Ride it and remote control it as close to the tower it can get. Then, raise the platform at its highest point and deploy your quadcopter from there. It should be able to reach the stingray at the top of the tower. After hacking it, the objective will be complete.
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For this mission, you have to hack Greystrom’s warehouse computer, located on the rooftop of the marked building. The room where the computer is located is locked by an access door. You have to hack the CCT in the ground level of the building. You can use the nearby Climbax scissor lift then have your jumper sneak to the stairs to reach the CCT. After hacking it and unlocking the door, you can recall the jumper and redeploy it to open the door and physically connect to the PC. Once done, the mission will be complete. This will also open a new connected side operation “Whistleblower”.