To sail a boat intelligently a helmsman must possess an elementary knowledge of the theory of sailing and know how the wind acts on the sails to drive the boat ahead.
Ukuqhuba isikhephe ngokuse zingqondweni umqhubi wenqanawa kufuneka abenolwazi ngoqhutyo, kwaye ayazi ukuba umoya uhamba kanjani kuqhutyo ukuze aqhubele isikhephe phambili