On the chart of Delagoa Bay, for instance, the magnetic variation is shown in the shape of "contour lines" and the annual increase of variation is stated on the chart legend at the top.
Kwimaphu yomatiloshe iDelagoa bheyi, umzekelo, uguqu-guquko oluncamathelayo luboniswe kwindlela, "yoyilo lomgca" nolwando lwarhoqo loguqu-guquko luchaziwe kweliphepha lomatiloshe lenkcazelo aphezulu.