Treasure map is an item found in the Message in a bottle on Goshima. Talking to Quartermaster Gully with this item in inventory allows the player to travel to the previously uncharted island of Agar Atoll. Players can talk to Salmon Ella to receive one taijitu.
Max? Where are you, sweetie?
Hurry back, dear. I miss you.
I've included my coordinates, just in case you've lost them. See you soon.
Love and huggles,Ella