Sea ports can be categorized on the basis of ship entry procedures.
The first category we end up with, when we categorize sea ports on the basis of ship entry procedures, is that of sea ports where all ships entering have to be piloted by captains allied to the ports. Thus, when the ships are nearing the ports, a pilot boat is sent to them, carrying the local captain who is supposed to take over, and steer the ships up to the berths.
The second category we end up with, when we categorize sea ports on the basis of ship entry procedures, is that of sea ports where the ships main/full-time captains are allowed to steer them right up to the berths. In these ports then, there are no rules requiring that captains allied to the port managements steer the final leg of the ships’ journeys.
You can study more about maritime management issues by buying books on the subject. This is something that you can even do online, in which case you can pay for the books using credit cards: for instance, the Citicards credit cards, which you can log into at the Citicards login page. But you don’t even need to be logged in, to transfer funds to the online book vendors using the cards.