Other than reefs and islands, the chief hazards were typhoons, and the kingdom of Corsairs who had wrested Formosa from the Dutch some years previously, and through whose waters they had to sail in order to reach Luzon. On this voyage both of those hazards struck on the same day: Corsairs sighted them and fell into an intercept course, but before they could close with Minerva, the weather began to alter in ways that suggested an approaching typhoon. The Corsairs broke off the pursuit and turned their energies to survival. By this point Minerva had ridden out several such storms, and her officers and crew knew how it was done; van Hoek could make educated guesses as to how the direction of the wind would change over the course of the next two days, and how its strength would vary according to their distance from its center. By setting some storm-sails and managing the tiller personally, he was able to arrange it so that they were not driven against the isle of Formosa. Instead the typhoon flung them out to the south and east, into the Philippine Sea, which was deep water with no obstructions. Later, when the weather cleared and they could shoot the sun again, they sought out a particular latitude (19° 45’ N) and followed that parallel west for two hundred miles until they had passed through the Balintang Channel, which separated some groups of small islands north of Luzon. Turning to the south then, they made way with great care until the hills and headlands of Ilocos—the northwestern corner of Luzon—came into view.