The supreme advantage of Hadley's quadrant (or octant) was that once the heavenly body had been brought (as regards its image) down to the horizon it did not leave it, no matter how much winds and waves tossed the ship.
Eyona inkulu ilungileyo sisahlulo sesine sesangqa sika Halidley (njegokuba zikumfanekiso) yayi sisibhaka-bhaka esinokuziswa ezantsi kuthe tyaba singashiyeki nokuba umoya namaza atosa inqanawa.