It should be realised also that it is very difficult for the tug to maintain position if the ship acquires any appreciable head- or sternway, or if there is a strong stream running.
Kufuneka kuqondwe ukuba kunzima ukuba udokolwane ayigcine ndaweninye inqanawa ukuba ibheka phambili okanye iyahamba emanzini okanye ukuba kukho umsinga onamandla.