The ferry service is evidently a system of motorized boats capable of carrying road vehicles and pedestrians. The entire system consists of two ferry terminals (one in Harwood, Portland and the other in Rockford, Staunton), and two identical large, blue-and-white ferries that alternate between both terminals.
In order to use a ferry service, player must wait until a ferry is docked at a ferry terminal, at which point, a yellow halo marker will appear on the dock in front of the ferry. The player must then drive or walk into the halo, and press a button in order to confirm entry into the ferry. Each ferry ride is $25. The journey can last for up to two minutes, due largely to the slow speed of the ferry, although the player can skip to the period when the ferry arrives at its destination to save time. Like the subway trains, the ferries cannot be stolen and controlled.
An alternative to the ferry is the incomplete Callahan Bridge. After "Driving Mr. Leone", a ramp is added on the gaps on the bridge, allowing the player to jump over to Portland or Staunton via this link.
The ferry service is threatened by two new road links, the Callahan Bridge and Porter Tunnel, both of which are under construction during events in the game. The possible obsolescence of the ferry service spurred union members to stage a strike that momentarily shut down ferry services, cutting Portland off from the rest of the city. It is only after assurances by the mayor's office that some of the worker returned to work (as depicted during "Driving Mr. Leone"), returning the ferry to normal service.
It is implied the ferry system was ultimately shut down following GTA Liberty City Stories, as little remains of the service during events in Grand Theft Auto III, which is set three years later, in 2001. The Portland terminal was demolished for the Portland exit of the Porter Tunnel, and a few warehouses were erected in place of the Staunton terminal.
- The Staunton ferry terminal features two ferry docks, implying the terminal may had formerly served two ferry lines, one possibly leading to Shoreside Vale.
- In the first trailer for Grand Theft Auto IV a ferry is shown, named "Liberty Ferry", suggesting that the ferries would be present in Liberty City; however, the ferries were unusable in the game (there are, although, ferry terminals in Alderney, and ferries connect Castle Garden City, Algonquin, with Happiness Island, but they can't be used by the player}.