If your transit line crosses varying depths, it will be useful to take an occasional sounding to know in which depth region you may be, then adding the tidal depth to the datum depth of the chart.
Ukuba imigca yakho yohambo inqumla ubunzulu obuzindidi kuza kusebenziseka ukuthatha izandi zeendidi ezithile sizokwazi ukuba yeyiphi na imimandla onokuba kuyo ze udibanise ubunzulu obucociweyo kubunzulu besichazi mhla kwiitshati