which boat.. there's one further in.. the second one kill as many blokes as you can with a sniper rifle first cos you'll need to use the rockets to choot down the boss in the chopper.. the first one i think i just ran around blasting everythinng in sight. be careful of the guy at the front of the boat with the minigun and also there's a bti where you get shto at from above by a guy aiming through a hole in the deck iirc. if you're stuck on the first one I wouldn't hold out much hope for some of the later levels though!

hth.