If there is a wind, or tidal stream or river current, from ahead, it is usually perfectly practicable in a single-screw ship to go astern on a backspring.
Ukuba kukho umoya, umsinga, okanye amaza ngaphambili, kufanelekile ukuba isikhephe esinesiqhubeli phambili esinye ibuye umva kwintambo yangasemva.