Navigation lights and lighthouses shown on a sea chart usually state their light characteristics, range of visibility, area of visibility and, in the case of a lighthouse, its height above mean sea level or highest mean tide.
Izikhanyisi zoqhutyo kunye nezikhanyisi zezindlu eziboniswe kwitshati yasewandle isoloko ichaza iimpawu zazo ezincinci, ukusuka ekuboneni nendawo yokubona, kwimeko yezikhanyisi zendlu, ubude bayo obungentla buthetha iqondo laselwandle okanye urhoxo nozaliso lomlambo olona luphezulu.