It is on the very left side on the map from the very bottom, go two spaces up and be prepared to fight a squid.
To get on diamond steppe island you have to hookshot the palm trees. If you don't have it yet, you can get the hookshot after defeating the mini-boss in the wind temple.
if you get to the point that you need the triforce chart in the ghost ship, sail right into it and you will go inside.
You will have to use the hookshot to latch onto the palm trees to enter.
In diamond steppe island to get on the island you need the hookshot.
Some island called diamond steppe. I believe it's somewhere in the south western quadrant of the sea but I could be wrong.
The ghost ship appears on certain spots depending on the moon. The Ghost Ship Chart shows the location of the ship in Diamond Steppe Island
You can get the Ghost Ship Chart inside this island by going through a sequence of warp jars. This chart will display where the Ghost Ship is located every night on your sea chart You will need the Hook Shot in order to get inside
You will need to go to Diamond Steppe Island and finish the grotto to get the chart. However, the Hookshot is needed to get inside first.
Dragon Roost Island
There isn't an Outset Island on Zelda Twilight Princess only in Zelda Wind Waker and other ones.
On Diamond Steppe Island. You'll need the Hookshot to get on the island. The mini dungeon is very annoying due to lots of floormasters, but when you get to the end, you'll get the ghost ship chart. good luck
There are a total of 49 islands on the The Legend of Zelda: The Wind Waker. Some of the islands are Seven Star Isles, Overlook Island, Crescent Moon Island, and Tower of the Gods. The complete list can be found on Zelda Wiki.
Island Seven-Star Isles(F1) Tingle Island(C3) Fire Mountain(F3) Private Oasis(E5) Diamond Steppe Island(A6) Two-Eye Reef(D7)
Outset Island, where you start out in the game.
Fire & ice arrows