Tactile Map

"Inuit Tactile Maps of Greenland":

[T]hese maps represent the contours of the coastline in a continuous line up one side of the wood and down the other. The contours of the land are highly exaggerated, allowing users to navigate entirely by feel. The navigator would often carry them under his mittens and feel the contours with his fingers to discern patterns in the coastline. Being made of wood, they are buoyant, so they float if accidentally dropped and could be easily retrieved.