THE SEA-VOYAGE FROM J APAN to Manila had in common with all other sea-voyages that it was all about latitudes. Van Hoek, Dappa, and several others aboard knew how to find their latitude by observing the sun’s position in the sky. The sun came out at least once a day and so they always had a good idea of which parallel they were at. But there was no way to reckon longitude. Accordingly, van Hoek’s charts and records of Hazards to Navigation tended to be organized by latitude. Along certain parallels they had nothing to worry about, because in this part of the world (according to the documents) no reefs or islands existed there. But along certain other parallels, hazards had been discovered, and so whenever Minerva was found to be in such latitudes the mood of the ship changed, sail was reduced, lookouts added, soundings taken. They might have been a hundred miles due east or due west of the Hazard in question; not having any idea of their longitude, there was simply no telling. Since the voyage from Japan to Manila was a north-to-south one, their degree of latitude, and their degree of anxiety, were changing every moment.