No Requirements to find; Must have access to the Arc to use.
Found randomly while skilling.
Can be read, in which case you will say "If I take this to my quartermaster in the Wushanko Isles, I can visit this island."
When in your inventory and talking to Quartermaster Gully
, he will tell you that the map in your inventory can help you get to an Uncharted Island without costing you any supplies.
It is possible to obtain 1 per day if you do not already have one in your inventory or bank.
It shows directions to a seemingly abundant uncharted island.