As with the Driftwood contract (if you have done it already) this contract asks us to bring the merchant contracter some materials; in this case 20 silk. If you have spare silk on you upon commencement of the mission, you can hand it in right away to complete the contract on the spot. If not, we’ll have to sail out into the nearby area to do some plundering.
To prevent any unnecessary conflict, as you cruise around the nearby area, pull out Edward’s spyglass and zoom in and out to identify ships in the area. When focused on a vessel, the spyglass will give you information about any cargo they might be carrying. Find a ship that is transporting some silk, attack it and board it to earn the materials.
Once you have 20 silk return it to the contract giver on the dock in Gibara to complete the contract.