This document discusses the parts of a boat, how to sail with the wind, and navigation during Columbus' time. It explains that the tiller is used to move the rudder, which is used to steer the boat in different directions. It also notes that keels are used to balance boats. The document then describes how to sail depending on wind direction and provides examples. Finally, it outlines some of the challenges of navigation for Columbus, including the use of caravels without keels, square sails, and lack of knowledge about destinations.