Two charted objects that are placed to indicate leading marks when in transit are sometimes used to convey a vessel safely down a channel or clear of danger.
Izinto ezimbini ezinjengeetshati ezibekwe ukuba zibonise iimpawu zokukhokela xa zisendlele/zikwisothuthi ngamanye amaxesha sisetyenziswa ukudlulisa inqanawa khuselekileyo ukuhla umfula okanye ukuyisusa kwingozi.