I would like to access the Omen Islands to do Carl's quest and need the map for it,I do have all 9 pieces of the Treasure Map but would like to know if that is the correct map or do I need to buy a different map set.

For access to the Island, you need the Uncharted Map, with these pieces: etc

If you still need those pieces, just make an empty offer here :) Trade Lot

Thank you,I offered