To get the In-Credible Chart, rescue your sister from the Forsaken Fortress. After those events, find any Mailbox to get this key chart from Tingle. It costs 201 Rupees, but it's well worth it. The IN ...
To get the Great Fairy Chart, first get Treasure Chart 41 on B-6: Five-Eye Reef. With the chart in hand, head to A-2: Four-Eye Reef and raise the sunken treasure: the Great Fairy Chart. This map shows ...