Ancient Sea Chart

The Ancient Sea Chart is a quest item from The Legend of Zelda: Skyward Sword. It is, as its name implies, a sea chart detailing the layout of the Lanayru Sand Sea in ancient times.

Story
After agreeing to help LD-301N Skipper recover his ship, Link is told that he must venture into Skipper's Retreat to find the Ancient Sea Chart, enabling Skipper and Link to navigate the Lanayru Sand Sea.