
click to enlarge

click to enlarge

click to enlarge
How do we do this? Try clicking on the ship's wheel. Noice anything happening when you do so? The boat tilts a little but it seems that a barrel of fish is keeping your vessel steady. Now, as a reminder, every time you start engaging Morgan in conversation, you will move to a different part of the ship. What's the purpose of this? Well some items can only be acquired or activated when you're at a particular part of the ship. So now you've moved to the main deck. Here you'll find that Winslow has been tied up and that well, barring present circumstances, he's doing ok.
Talk to Morgan again so you'll move to the stairs (where the map is). Here you'll find a seagull pecking at your hand. Beside it, you'll find the grappling hook Morgan Le Fley used to board your ship. Grab it and attach it to your hand.
Don't know how to? Access the invetory and click on the hook, the cursor button will now chance to the small image of the hook. Now once that's done, move the hook to yourself (Threepwood) and attach the hook automatically.
Talk to Morgan again to go back to the where the wheel is. Using your hook, you can now attach yourself to the rope heading off to where the mast is. Remember that barrel of fish on the mast? Cut it off using your sword so it slides to the other end. Once you've done that, talk to Morgan again and head back to the main deck.