The Pirate Hunters by Robert Kurson

looking for a great beach read?  Join the crew for one of the largest pirate treasure hunts in history! Here's a tease-
  "...crew planned to move in lanes seventy-five feet wide, each of which stretched for a mile, then to dive every one of the hits the mag detected, looking for any iron remnant from the wreck of the Golden Fleece. If the first grid failed to produce evidence of the shipwreck, the men would set up a new grid, adjacent to the last, and survey that area, and they would continue expanding, mowing more lawns until they'd found their pirate ship.
But Bowden had provided the men information from historical records that helped narrow the search. The Golden Fleece, he told them:

---had sunk in twenty-four feet of water
—had muskets scattered on her deck
—had been careening when confronted by the Royal Navy warships "
taken from The Pirate Hunters by Robert Kurson