After obtaining 
Old Sheepskin Scroll, double-click it to receive a map:
Ancient Pirate Treasure Map — contains coordinates somewhere on the main continent of Ascaron.
The map has a loot table that can be viewed in the in-game database. You can also see it in the article.
Before the first double-click, the map remains unidentified. The first click determines the location and coordinates of the treasure; you can do this from anywhere.
Clicking the map again checks your current location. If you are in Ascaron, it attempts to start Auto Route to the specified coordinates. In any other location, the map only displays the coordinates and area where the treasure is buried.
*In some locations, autorun may not work. In this case, you'll have to get to the coordinates yourself.
Once you reach the coordinates shown on the map, double-click it to receive a random item from that map's loot table. The map then disappears.
Restrictions:
- Only one map may be kept in the inventory.
- OSS can be traded or dropped, but an opened map cannot.
- An opened map cannot be locked or stored in the bank, but it can be deleted.