<prompt> Je, unaweza kueleza jinsi wavumbuzi wa mapema walivyoendesha meli zao kwa umbali mrefu bila kutumia tekinolojia ya kisasa?  <response>: Wanasayansi wa kale waliendesha meli zao kwa kutumia njia mbalimbali kama vile celestial navigation, dead reckoning na landmarks.Wanasayansi wengine walitumia upepo na mtiririko wa bahari kuongoza safari zao.Wanasayansi wengine walitumia njia nyingine kama vile navigation skills, experience, and knowledge of the seas to navigate in unknown waters. 