The goal of each Merchant Ship is to sail to the opposite Map Card with a Port from where it started. First, the Orange Merchant Ship sails 1 towards the Port it points to, and then the Green Merchant Ship sails 1 towards its Port.
When sailing, keep the ship pointed in the direction of its target Port. This ensures that it is always moving in the correct direction. The player to the right of the active player chooses which Map Cards the Merchant Ships sail to, as long as that moves each ship toward its target Port.
When a Merchant Ship reaches its Port, it turns around and now points to the opposite Port. It also delivers its Booty, so return its Booty to the bag and draw a new Booty for it. Merchant Ships are not affected by Storms when sailing.