I realy stuck on this and need help I trying to get to nasrad or maramba..

Im assuming your at sailor's Island, either first arriving, or after you guided the merchant to Nasrad. Basically i'll give you some step-by-step. Once you landed on the little jack, sail toward sailors island, basically once you gain control fly north by northeast and you'll see a mountian with a tunnel, head through it and on the other side VERY VISABLY will be sailors isalnd almost immediatly. Dock and then afterwards head to the ship shop (its got a wheel hanging by it's doorside). Select "talk about various things" and he'll give you some information needed to continue about a harpoon cannon. Talk to drachma, and "beat around the bush" about your information and he'll agree to take you, head into the guild accross the way and talk to the man behind the desk. You'll end up agreeing to take a nasrad merchant to the city in exchange for some documents. Do so and after wards you'll be headed to VALUA. A rather decent chunk of the game occurs next, but after it is finished, you will be heading to Maramba, which is through the stone reef you have been seeing. The only way to make it through this stone reef is with a special cannon mounted in front of your ship, you'll know it when you have it. The game will progress naturally though there and you don't actually make it to Nasrad for quite some time, so don't try untill you know thats your destination. Any confusion, please ask with detail what is needed to be known.

You need to go to sialors island and go into the guild shop
Tak to the guild master and a man will walk up to you.
Escourt him there and then you can get through.