The basis for using corrected parameters on the map is mach number kinematic similarity. Corrected flow and speed define mach numbers through the compressor and flow angles onto the blades using velocity triangles. Velocity triangles allow flows to be transferred between different reference frames. In this case gas velocity and circumferential blade velocity in a stationary frame is converted to velocity in a rotating frame (rotor) passage. Losses in blade and vane rows depend primarily on incidence angles and mach number. A particular operating point on the map determines the mach numbers and flow angles everywhere in the compressor.