In heavily trafficked areas, shore radar chains have been installed which provide a useful back-up to the shipborne radar, since they enable navigational advice to be offered to the ships by radio-telephone from a central control station.
Kwiindawo ezinetrafiki ezinkulu, isixhobo sonxweme esibonisa inqanawa zifakiwe, esinika usebenziseko lokujonga kwinqanawa etsalayo sukela ukuba sikwazi ukunika ingce biso kuqhutyo-nqanawa, lunikwe kwiinqanawa ngeemfono-mfono zikanomathotholo ukusuka kulawulo oluphakathi kwesitishi.