look for water in the adjacent islands.

He accordingly coasted them all with the greatest care, and found in most
of them considerable quantities of water in the holes of the rocks, but
so mixed with the sea-water that it was unfit for use; and therefore they
were obliged to go farther. The first thing they did was to make a deck
to their boat, because they found it was impracticable to navigate those
seas in an open vessel. Some of the crew joined them by the time the
work was finished; and the captain having obtained a paper, signed by all
his men, importing that it was their desire that he should go in search
of water, he immediately put to sea, having first taken an observation by
which he found they were in the latitude of 28 degrees 13 minutes south.
They had not been long at sea before they had sight of the continent,
which appeared to them to lie about sixteen miles north by west from the
place they had suffered shipwreck. They found about twenty-five or
thirty fathoms water; and as night drew on, they kept out to sea; and
after midnight stood in for the land, that they might be near the coast
in the morning. On the 9th of June they found themselves as they
reckoned, about three miles from the shore; on which they plied all that
day, sailing sometimes north, sometimes west; the country appearing low,
naked, and the coast excessively rocky; so that they thought it resembled
the country near Dover. At last they saw a little creek, into which they
were willing to put, because it appeared to have a sandy bottom; but when
they attempted to enter it, the sea ran so high that they were forced to
desist.

On the 10th they remained on the same coast, plying to and again, as they
had done the day before; but the weather growing worse and worse, they
were obliged to abandon their shallop, and even throw part of their
breath overboard, because it hindered them from clearing themselves of