The boat is stable, but not very fast. They're closer to home than they would have been if they stayed on the island, but they're still a long way away. They need to be careful, though, because the water currents can change the direction of the boat. Asuka suggests that they set up a compass so they can track the boat's course. They can use the sun's rays to figure out the direction, and the wind's currents to steer the ship.