They indicate to harbour craft the positions of the pro- pellers and they should be shipped whenever the ship docks or berths alongside, or whenever she is manoeuvred by tugs, or when other vessels are berthed alongside.
Zibonisa kubugcisa bezibuko indawo ezikuyo iziqhubi kwaye kumele zikhweliswe enqanaweni naninina xa inqanwa imisa edoksini okanye naninina xa iqalisa ukuhamba, oknaye naninina xa inqanawa zifakelwa indawo zokulala ecaleni.