Task: Translation
Input (English): The geometric centre of gravity of the water plane at which the vessel floats, forward or aft of the middle perpendicular. It is that point about which a vessel rotates longitudinally when actuated by an external force without change in displacement.
Output (Xhosa): Indawo yozinzo nemigca neembombo yomgangatho wamanzi ekulapho inqanawe idadela ngakhona, ngaphambili okanye ngomva wombindi othe nkqo.