To find the distance off the light when it rises or dips, subtract 4,5 miles from the range given on the chart for the respective light and then add the additional distance to the observer's horizon.
Ukuze ufumane umgama ukusuka kwisikhanyisi xa ikhulo okanye isihla/incipha, thabatha isine esine -- cola lemayile ukusuka kumlinganiselo onikwe kwitshato ukwenzela ukukhanya wandule ukudibanisa umgama owongezelelweyo kukudibana komhlaba nesibhakabhaka wombukeli.