Sea Chart

The Sea Chart is an invaluable item found in The Wind Waker and Phantom Hourglass. This item is used to keep track of the various islands located in the Great Sea.

The Wind Waker
The Wind Waker's Sea Chart is split up into 7-by-7 sections. When Link first receives this item, it has only a small portion of the islands charted in it. It is eventually learned that giving a Fishman some All-Purpose Bait while in a section of the Sea Chart that has yet to be charted, the Fishman will mark the location of the island on the Sea Chart, along with passing on some useful information.

Phantom Hourglass
In Phantom Hourglass, the Sea Chart is much smaller, being split into four sections with several islands each. Link uses the Sea Chart to find the Ghost Ship and rescue Tetra. Eventually Link was able to find all four parts of the Sea Charts located inside the Temple of the Ocean King. Islands are charted differently in this game, with most of the islands already displayed on the Chart upon obtaining that section. There are, however, uncharted islands which automatically become charted upon visiting them.

Bizarrely, the Sea Charts in Phantom Hourglass take on the same appearance of the Treasure Charts in The Wind Waker, while the Treasure Maps in the Nintendo DS title are reminiscent of the Special Charts, which are absent.

Related Charts
In Oracle of Ages, Link must have an Island Chart in his possession before Rafton lets Link take his raft out onto the Sea of Storms.

Skyward Sword requires Link to obtain the Ancient Sea Chart from Skipper's Retreat in order to explore the entirety of the Lanayru Sand Sea and locate the Sandship.