It shows you where all of the triforce charts are. Once you find them, tingle has to identify them for 398 rupees each. After he identifys them, it will also show the location of the triforce shards.
You need to get Treasure Chart #26
You will need to find the 8 Triforce charts. Be using the Incredible chart, it will tell you where each chart is located. After you collect and decipher a triforce chart, you can check it or the incredible chart to find the location of the Triforce Shard. You will then have to sail, or teleport and salvage the chest with the grappling hook.
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.
Chart located at Six-Eye Reef (D4), treasure located Northern Triangle Island(D3). Treasure is the Octo Chart!
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.
I would say The Wind Waker.
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!
In the accepted Zelda timeline, Phantom Hourglass is after Wind Waker. When talking about release dates, Four Swords Adventures is after Wind Waker.