If the current during the two hours of your crossing averages 1 kn. southwards (time-tables) it means that the whole body of water with you on it will be displaced southwards for two nautical miles by the end of your voyage.
Xa kusetyenziswa ngexesha iiyure ezimbini ukugqitha umgangatho ophakathi komzantsi gcino uyi 1km(isicwangcisi xesha) ithetha ukuthi umzimba wonke wamanzi wena okuwo uza kushenxiswa kumazantsi gcino kangange mayile ezimbini ezisetyenziswa elwandle xa kufikelele isiphelo sohambo lwakho ngenqanawa