You hand the Meat over to the navigator, who hands it over to the quartermaster, who hands it over to an accounts payable rep, who hands it over to the grog purchasing agent, the food acquisition specialist, and the convenience store clerk, and soon the ship is fully outfitted for a voyage.
The navigator squints at you and asks "That's that, then. To what coordinates would you like to sail in search of booty, Cap'm?"
"Aye aye, Cap'm!" says the navigator, and there is a bustle of activity as the ship leaves port -- sails are unfurled, masts are hoisted, pulleys are winched, all that kind of shippy stuff. Pretty soon, you've lost sight of land, and open sea lies... um... open before you as you sail towards your destination.
The navigator says "Sorry, Cap'm, but we can't sail to those coordinates, because that's where the mainland is, and we've pretty much plundered the mainland dry. Perhaps a more exotic locale is in order?"
Exploration of the map is in progress. See the talk page.
Choosing invalid coordinates results in the following message:
The navigator sighs. "Those aren't valid coordinates, Cap'm. Care to try again?"
The Kingdom of Loathing is present on this map, largely occupying an 11x11 region beginning at the coordinates (11,11). Several coordinates in this region contain ocean, resulting in the area resembling that portrayed on the Main Map.
Jick on the 12/10/07 Radio Show confirmed that only the first person to each island got the "Special Prize"
The Rainbow Pearl locations form an arrow on a map, likely a reference to the 'Rainbow Worlds' of Star Control II. These were left by an advanced race for future beings to be able to find them should the need arise, as well as being convenient toxic waste dumps.