Grand Theft Auto IV Walkthrough

As usual, you'll want to save your ammunition during this chase, holstering your weapon to concentrate on driving the boat. Driving the boat is more difficult, obviously, than driving any car anywhere in the game, and you are unlikely to be able to maneuver your boat in the same ways that the CPU maneuvers theirs. So, try to stay out of close quarters boating as you go, taking more open parallel routes as you stay on the tail of the aggressors. Dodge any ships that drive in between you and your target, as well, and remember to keep an eye on your HUD if you lose track of the boat, since the red dot on the HUD will represent the ship's location.

Eventually, the ship will dock on the Dukes/Broker shared island. You should dock your boat too and give chase, on foot, of the three culprits from the ship. Wield an automatic weapon of your choice and choose one of the three red dots on your HUD, as they will spread their positions out. The layout of the terrain is uneven, so try to approach each enemy from high ground if possible. When all three enemies are eliminated, the game will prompt you to head back to Bernie in the boat. Do so, and he'll take off, leaving you on your own. But not before thanking you for a job well done, of course!