Though it was necessary to prepare for a long stay, the commander took the requisite measures for attracting the notice of any passing vessels. A high flagstaff was put up in the centre of the fort, from which the British ensign was kept flying from sunrise to sunset, and on the two highest points of the island piles of firewood were placed ready to light up at night, should it be considered expedient to try and attract the attention of any ships seen in the offing. There might, however, be a danger in doing this, lest a stranger, standing too close in, might run on the rocks. By firing guns, however, she might be warned off. Of course, by these means it was as likely that an enemy would be attracted to the spot as a friend, but this caused them no anxiety, as they could beat off any vessel which might come with hostile intentions. Day after day, however, went by, and no sail appeared in sight. As soon as the weather moderated the boats were launched, and the second lieutenant and master, with Crowhurst, pulled round the island and surveyed its approaches in every direction. They found but two channels through which a vessel of any size could approach to attack them, and that could only be done with the greatest caution, by those who had a thorough knowledge of the navigation. Indeed, the island was almost completely surrounded by reefs, some rising above the surface, others sunk beneath it at different depths. These, it was found, extended to a considerable distance from the shore, so that no craft of large size was likely intentionally to approach. After the survey had been completed, Lieutenant Foley offered to try and make his way to Jamaica in the pinnace, the largest boat which now remained, the launch having been lost with the ship. "I cannot let you go," answered Captain Olding. "Even should the weather continue favourable, the probabilities are that you would be picked up by a Spaniard or a Frenchman, and you would fail to reach your destination." "But I might as probably be picked up by an English man-of-war or a merchant vessel, sir," answered Norman, who was eager to make the attempt. The commander, however, was inexorable, and the lieutenant did not again for some time venture to broach the subject. The shipwrecked crew continued in vain to look out for relief, and Commander Olding remained firm to his resolution of not allowing one of the boats to try and make her way to Jamaica. Notwithstanding the refusal Lieutenant Foley had received, Mr Billhook, the master, offered to take charge of the pinnace with four or five volunteers. "No great harm can happen if we are taken, sir, and still less, some will say, if we go to the bottom, but the chances are we get clear and arrive all right," he urged.