Where is David when he awakes and what are his circumstances?

David is aboard the ship and out at sea.

The whole world now heaved giddily up, and now rushed giddily downward; and so sick and hurt was I in body, and my mind so much confounded, that it took me a long while, chasing my thoughts up and down, and ever stunned again by a fresh stab of pain, to realise that I must be lying somewhere bound in the belly of that unlucky ship, and that the wind must have strengthened to a gale.