Kosatka

Learn how to locate the Sonar Jammer for the Cayo Perico Heist in GTA V. This guide walks you through finding the Kosatka submarine and completing the mission.

Alright, so you've activated the mission from the planning board on your new submarine, the Kosatka. You've got two options here: either use the sub to fast travel closer to the Merryweather Test Site, or just drive there yourself. Once you're near the destination, head onto one of the nearby islands. Your first job is to take out any Helicopters and Boats that show up from a distance.

After you've cleared the area, it's time to dive in. Head deep into the water and find the Submarine's top hatch. Get inside and slowly make your way down to the lowest deck, taking out any enemies you encounter. Keep following the path until you reach the Sonar Jammer. Grab that device, then exit the submarine.

Swim back over to the islands. You'll want to take out any remaining Choppers here. Then, call your Dinghy using the Interaction Menu and use it to get back to the mainland. Finally, grab a car, drive back towards your submarine, and deliver the sonar jammer. That's the mission done!