This document discusses different types of map projections used to represent the spherical Earth on a flat surface for navigation purposes. It describes projection as a method to transfer the curved Earth onto a flat chart. There are three main types of projections discussed: conic, azimuthal, and cylindrical. Conic projections use a cone to map specific areas, azimuthal projections map to a plane tangent to a pole, and cylindrical projections wrap a cylinder around the Earth. Specific projections like Lambert conformal conic and polyconic are described within each category. The document provides details on how each projection displays shapes, angles and distances to suit different navigation needs.