In poor visibility the signals may be made in the ship by giving a short blast on the siren, foghorn or whistle.
Apho kungacaci kakuhle imiqondiso mayenziwe enqanaweni ngokwenza uqhushumbo olufutshane kwixilongo elikhaliswa ngombane, kwixilongo elikhaliswa yinqanawa xa ivalelwe yinkungu okanye impempe.