This is a hint which makes Mission 12 a little bit easier. Personally I find it good because battling the gang members on the deck can be a bit frustrating especially when you're doing fine but Yasmin manages to get herself killed. Near the Sol Vita's gang plank (where you get onto the deck of the ship) is a large dock crane. It is attached to a platform containing some orange coloured oil drums and some boxes ready to be loaded onto the ship. At the back there is a gap where you can walk onto the platform. Once you do so the cargo is loaded onto the ship with you on it. This means you don't have to have a shoot-out with all those gang members on deck, which can be a bit frustrating at times.
You can't miss spotting the crane!
Walk onto the platform where the gap is.
NOTE: If the movie doesn't start walk further onto the platform. You can be standing on it without triggering the movie if you aren't close enough to the centre.
A FMV sequence will begin showing the crane loading the goods onto the ship (with you on it).
You will be put down here, bypassing most of the gang members on the deck.