Optional objective: Limit regular kills - 15
To begin the mission, head to the cemetery where you will be caught by the Templar soldiers.
NOTICE! In order to obtain full synchronization, make sure you have at least one arrow before beginning this mission. It will make completing optional objectives easier.
Counter the enemy attacks and kill two groups of enemies.
The further path will leady you to a ferry marked on the map. Climb it and go round from the right. You need to reach the designated spot.
From there you have to reach the nearby window and eavesdrop on the conversation.
When the men are done talking, slowly move further to the right, get aboard the ship and follow the guard behind his back to the marked spot.
Hidden behind the boxes, eavesdrop on the second conversation.
Optional objective: Escape the HMS Jersey without entering into open conflict.
Optional objective: Kill the HMS Jersey's captain.
Optional objective: Completed all the constraints in one playthrough.
You will now have to leave the ship. If you're not interested in the optional objectives, you can just jump into the sea and the mission will end. However killing the captain without raising an alarm isn't all that hard, as all you have to do is climb onto the roof and shoot him from a bow.