In 1601, the Spanish viceroy in Mexico City, Gaspar de Zúñiga, 5th Count of Monterrey, appointed Vizcaíno general-in-charge of a second expedition: to locate safe harbors in Alta California for Spanish galleons to use on their return voyage to Acapulco from Manila. He was also given the mandate to map in detail the California coastline that Juan Rodríguez Cabrillo had first reconnoitered 60 years earlier. He departed Acapulco with three ships on May 5, 1602. His flagship was the "San Diego" and the other two ships were the "San Tomás" and the "Tres Reyes".