User blog comment:Dodo8/Troubles completing "Catch the Wave" in GTA IV/@comment-4200418-20120717214050

It's a hateful mission, I'll give it that. Just don't drive like a bat out of hell or else you're going to find yourself stuck in traffic for years.

For the warehouse portion use the auto-aim feature, it's somewhat of a life-saver. Don't stay next to the truck for a long time (if you do you increase the likelyhood of them blowing it and you up). Stay close to Phil, he's an idiot in this mission and you're going to have to take a few bullets for him.

For the boating portion, run. Don't even slow down, just keep the boat at full speed and if you need to, kill the enemy drivers. If you kill the drivers the other guys are dead in the water.

The big thing is just protect Phil at all costs, but I guess that's kinda obvious. I completed it by rushing through most of the gun fight and just getting into the boat and running. There's quite a bit of luck involved too. Hope this helps, although I doubt it.