The mile used was the geometric mile or little sea mile of 4100 English feet, and distance sailed was reckoned by means of the sand-glass and the navigator's estimate of the ship's speed.
Imayile ezasetyenziswa zaziyimigca ezimbombo zemayile okanye ilwandle elincinci lwamawaka amane linekhulu leenyawo zesingesi, umgama wohambo ngenqanawa wabalwa ngedlela yeglasi yomhlaba.