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A navigational chart is the primary source of information for the navigator. The main component that contributes significantly to the safety of navigation is the information on the depth of the area. A sonar, which uses acoustic waves is a device for bathymetric measurements and it measures the vertical distance between the head and the bottom or an object located at the bottom. For the purposes of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.