Naval vessels include several dozen boats, dozen or more of which are for riverine patrol, including the piranias, and riders, which are powerful river boats. In addition, Bolivia has several seagoing vessels, including the "Santa Cruz de la Sierra" (PR-51), and several flagged ships that sail with the permission of the "Capitanias Navales" Naval Registration Office. The "Libertador Simón Bolívar", a ship acquired from Venezuela, use to navigate from its home port in Rosario, Argentina on the River Paraná. In 1993, the Navy was formally renamed the "Naval Force" ("Fuerza Naval") and moved with the Bolivian Army under a single military authority.