You need to get Treasure Chart #26
You need to get treasure chart #26 in order to find the octo chart.
When you get the ghost ship chart, head for where the chart says and ram the hull.
Once you have gone to the forsaken fortress the second time it should be marked on your sea chart
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.
There is no super Deku leaft in Wind Waker.
On the Sea Chart, it's five squares down from the Forsaken Fortress.
Treasure chart #26 is located at 6 eye reef. After you clear the Forsaken Fortress for the second time, you come here and destroy all the wall-mounted cannons. Then a chest should appear. So now you would walk on the outer wall of the reef and use the wind waker to change the direction of the wind and then use the deku leaf to fly over there! Then you can use that chart to find the big octo chart. Hope this helps!
I would say The Wind Waker.
In the accepted Zelda timeline, Phantom Hourglass is after Wind Waker. When talking about release dates, Four Swords Adventures is after Wind Waker.
#1 you dont get the triforce chart from the ghostship, you get it from the big hole with the head covering it on outset island, search my posts, i discussed it in a previous post
On the GameCube controller, press the up button on the d pad to open your sea chart. Then press y button to go to your treasure charts