Kong, Iran - Nakhoda Sarhang explains about steering Lenjs in traditional way before the era of GPS. "Navigation was mainly done by sextants, compasses and charts. Precise navigation techniques were needed to locate the ship according to the position of astronomical objects using special formulae. The navigation and weather forecasting knowledge was traditionally passed on from father to son. Nakhoda was responsible to verify the location and direction of the vessel everyday at noon using compass and charts."