Although Orca3D uses a mesh to compute most of the hydrostatics, certain quantities can only be computed from stations. These include the prismatic and maximum section coefficients, and of course the sectional area curve. Orca3D uses the stations that are defined in the OrcaSection command to compute these quantities. In order to get accurate values, you should be careful to use a reasonable number and distribution of stations. The ends of the hull, and any areas of distinct section change should be captured in order to get an accurate sectional area curve, and you should have stations near the station of maximum sectional area in order to get an accurate Cp and Cx (note that you don’t need to find it exactly; Orca3D will interpolate, using a quadratic function over three stations, to find the maximum).