The angle between your engine trail (called a wake by seamen) in the water and the keel line of your boat gives an indication of how much the combination or opposition of wind and current affect your actual direction.
I-engile ephakathi komsila we-injini (ibizwa ngokuba yindoda yaselwandle evukileyo) emanzini kwaye umgca osisiseko senqanawa kwisikhephe sakho inika ubonakaliso lokuba kudityaniswa njani na okanye isichasi somoya nomsinga ochaphazela uzinzo ecaleni.