✹ About Friday 26 June 1663 E on 27 Jun 2016 • Link The word "compass" here could most likely be understood to mean "afford." African slavery was extensively employed around the Mediterranean. I would guess that the captain may have demanded that Sir William pay him cash on the spot for the slave, as it would not do at all to extend credit on such a business matter until the ship went in to port. The captain certainly would not have wanted the freed slave remaining on board, either. As the representative of the ship's and cargo's owners, this is responsible behavior on the captain's part.