The second location is this separate missile room, where the jammer will be at the end of the room on a green crate. One location is the main control room, the same room where you plan your Cayo Perico heists. This saves us a great deal of hassle to look for the device specifically.
The good thing about the jammer is that it will instantly appear on your mini-map when you are near the jammer or in its general vicinity. The jammer will be in a random location every time you do this mission. Keep moving forward as you eliminate the guards, and keep an eye out for a sonar jammer.
The layout of the submarine is similar to the one you own, and the one seen during the Bogdan Problem of the Doomsday Heist. When you are inside the submarine, you will find a lot of guards as you proceed forward. Go to the middle of the yellow circle and you will notice a yellow marker on top of the submerged submarine that will allow you to enter it.
You will see a huge yellow region on your mini-map. When you reach the test site, you will find one attack helicopter and three boats. You will need to fight your way to the sonar jammer once inside the submarine. It would be best if you used either a Buzzard or an Oppressor Mark II to get to the location as you will need to clear out the patrolling attack helicopters and boats.Īlso, stock up on the maximum number of armor and snacks as this mission is combat-heavy. The sonar jammer will be located inside a submarine at the test site. Once you start the mission, you will be tasked to go to a Merryweather Test Site to acquire a sonar jammer in the middle of the ocean. The Submarine Kosatka prep mission is a mandatory prep mission used as your main mode of transport to the island if you haven't scoped out other optional locations that give access to other approach vehicle missions. These are completely optional but give you an added advantage such as weaker guards, weapon damage, and no air support when the guards are alerted.
Besides the mandatory prep missions, you also have optional prep missions that may or may not give you an added advantage during your heist finale. This guide focuses on all the prep missions that the Cayo Perico heist offers, guiding you through all the missions. The prep missions are available based on how well you do during the scope out. The Cayo Perico heist is heavily based on RNG (randomly generated numbers) when scoping it out.