X Marks the Spot is an object in the Shipwrecked DLC, and it appears only after its location has been revealed by reading a Message in a Bottle. It appears as two X-crossed bones over disturbed soil. It can be dug up with a Shovel to reveal, or shot with a Boat CannonBone Shards and a Chest, which contains several pieces of treasure. There is a 1% chance for a Booty Bag to spawn as well.
The game has fixed presets of the treasure chest loot, mixed with some random loot plus some chance loot.
One of these items is always added to the treasure chest, based on a weight list (the higher the number, the higher the chance of appearance).
Each item in this loot table has its own chance of appearing, or not. So it is possible to get every item or none .
Standard Random Loot:
As of now, nearly all outcomes have the same Loot Table for Random Loot:
all equally weighted (1)
Standard Chance Loot:
As of now, most outcomes have the same Loot Table for Chance Loot: (25%)(25%)(10%)