The purpose of SA is to calculate hull and deck surface areas and centers of gravity. This is not the same as wetted surface (which is provided in the Main Program) but rather it takes the entire area of the hull component up to the deck edge and provides not only the area but the center of the surface, making it useful for weight estimates. At present, the SA module is in a very preliminary form. It is being made available to GHS users "as is" without additional charge.