The pilots of plane use the aeronautical diagrams based on an isogonic conical projection of
The pilots of plane use the aeronautical diagrams based on an isogonic conical projection of Lambert, in which a cone is wide above the chapter of the ground to trace. The cone intersects the sphere (ground) with one or two parallels which are selected as standard lines. This makes it possible to the pilots to trace an approximation of route of large-circle on a flat and two-dimensional diagram.