Since this relies on camera input data, the application was designed with Mobile Safari in mind. The Pickled Cartographer uses WebRTC and some rudimentary computer vision techniques to identify treasure maps in Sea of Thieves. Players are expected to use their shipboard maps to identify these islands. In Sea of Thieves you can retrieve in-game treasure maps that describe only the shape of the island and the location of treasure.
Identify island maps in Sea of Thieves using a second device!