When the vehicles leave the warehouse, run up behind the guy by the red crates and whack him. Now run up behind the other guy and whack him too. Go out the large door and head towards the Lexus near the gate. A guy with an AK will come from around the corner shooting at you. Pop him and steal his AK if you don't already have one, either way you can steal it for more ammo. Get in the Lexus and head to the next destination. Here are the directions to get there from the front gate of the depot:

Take the road straight ahead of you(The way you came to get to the depot from the previous mission)

Keep going down this road until you see a bridge overhead(From building to building)

Turn left at the next intersection after the bridge

Keep going down this road for literally a couple of minutes until you reach an intersection that has blue and white buildings on either side

Take a right turn at this intersection

Turn right again and cross the bridge

Turn left at the next intersection

Go down this road until you see an open gate on your left

Go through the gate and turn right

Park beside the 3 white vans and board the boat just like you did with Hammond. If you don't make much noise then no one will know that you are there right when you walk up the stairs. Whack the guy right in front of you then turn right and circle around the board blasting anything that moves. When you get to the far side(the opposite side of where you got on) you can see more guys way down at the other side of the boat but you can't hit each other from your positions. Heal now if you need to. Make your way towards them and blast anyone that you can hit. When they're all dead, look around you for anyone else, then head to the back of the ship on the right side. When you get near the end, Jake pokes out and shoots at you a bit. You can't kill him now so just run towards him. He runs into the room right around the corner then he sends out 2 guys from the room, so if you need to heal, kill those 2 before you do. 2 or 3 more guys should come out of nowhere. Blow them away too and pick up an AK 47 off the ground. Now go into the room where Jake went. Stay to the left of the stairs and go around the corner and up the next stairs. When you get to the top, press auto-aim and you'll automatically turn around and aim at one of the 5 guys that you need to kill. Dual pistols works better than an AK but you can use whatever you want or have. Theres one guy in the kitchen to the left, two come in through the door in front of you, and there's two behind the table to the far right. Take out the ones on the left side first, then head over to the table and blast the last two guys. Go out the door where those 2 guys came from and blow away the guy to your right. Now a guy with a shotgun comes from the room you just exited. Murder him then go up the stairs out on this balcony. You see Jake again and he send 2 guys again to try to kill you. Kill them with dual pistols if you have them, then run to where Jake was. He gets on a load that is being held by a crane and it moves and takes him down to the the deck on the other side of the ship. Now you have to head down to where he is. Grab the shotgun on the ground one level down if you want, or take the AK which the guy in the kitchen dropped if you didn't already take it. You might encounter someone on the way down. If you do, blow them away and heal before fighting Jake. When you get to where he is, locate him and blast away at him with any weapon. Best effect is the AK then dual pistols. Go up the stairs on the left or right side and he will come towards you. If he gets close to you then whack him or just keep shooting at him until he drops to the ground. There isn't much description here on how to beat him, but there doesn't need to be because it's not hard. If it's hard for you, then you're doing something wrong or not doing something right. When he's down, go up to his corpse and the mission is complete.