It was easy enough to avoid all such breakers as would be dangerous to a boat, by simply keeping out of white water; but the Bridget could pass over most of the reefs with impunity, on account of the depth of the sea on them. Mark beat up, on short tacks, therefore, until he found the two buoys between which he had brought the ship, and passing to windward of them, he stood off in the direction where he expected to find the reef over which the Rancocus had beaten. He was not long in making this discovery. There still floated the buoy of the bower, watching as faithfully as the seaman on his look-out! Mark ran the boat up to this well-tried sentinel, and caught the lanyard, holding on by it, after lowering his sails.
The boat was now moored by the buoy-rope of the ship's anchor, and it occurred to our young man that a certain use might be made of this melancholy memorial of the calamity that had befallen the Rancocus. The anchor lay quite near a reef, on it indeed in one sense; and it was in such places that fish most abounded. Fishing-tackle was in the boat, and Mark let down a line. His success was prodigious. The fish were hauled in almost as fast as he could bait and lower his hook, and what was more they proved to be larger and finer than those taken at the old fishing-grounds. By the experience of the half hour he passed at the spot, Mark felt certain that he could fill his boat there in a day's fishing. After hauling in some twenty or thirty, however, he cast off from the lanyard, hoisted his sails, and crossed the reef, still working to windward.
It was Mark's wish to learn something of the nature and extent of the shoals in this direction. With this object in view, he continued beating up, sometimes passing boldly through shallow water, at others going about to avoid that which he thought might be dangerous, until he believed himself to be about ten miles to windward of the island. The ship's masts were his beacon, for the crater had sunk below the horizon, or if visible at all, it was only at intervals, as the boat was lifted on a swell, when it appeared a low hummock, nearly awash. It was with difficulty that the naked spars could be seen at that distance; nor could they be, except at moments, and that because the compass told the young man exactly where to look for them.