When alongside, the possible dangers arise from the vertical movement caused by tide and from a horizontal to-and-fro movement caused by a scend entering the harbour.
Xa esecaleni, ubungozi obunokwenzeka buvela kwintshukumo ethe nkqo eyenziwa kukuzala nokurhoxa kolwandle ukusuka kwintshukumo ethe tyaba eyayo nesuka eyenziwa kukunyuka komphambili wesiphelo senqanawa ngexesha umva ubetheka elwandle ongena elunxwemeni.