This is the longitudinal X-position of the centre of the volume of the underwater portion of the hull. It is calculated by the Hydro Calc command. It is referenced from the forward perpendicular (FP at X=0). Be careful, because some texts reference this value from amidships and some define it as a percentage distance (of LWL) aft of the forward end of the waterline.
Obu bubude bendawo engumbindi womthamo wamanzi angaphantsi kwesiqu senqanawe. Oku kubalwa nge-Hydro Calc. Iboniswa kwepali eme nkqo engaphambili. Lumka kube eminye imibhalo ibhekisa kukuxabiseka kombindi wenqanawe womva ezinye ziyichaza njengomgama.