How does a marine chart plotter work?

A chart plotter is a Marine electronic navigation system that combines a GPS receiver with the capability to display electronic charts/maps, enabling the boat owner to continuously monitor the position and movement of his craft in relation to the surrounding physical environment, both above and below the water.

With its integral processor combining Marine GPS data with electronic charts — the accuracy of which influences the efficiency of the system — a chart plotter pinpoints the location of the vessel and can use the GPS data to calculate boat speed and direction, as well as determine the time and distance to the destination or next waypoint. It displays all this data in real time so that a navigator knows exactly where his boat is and where it’s heading, as well as continuously updating its position relative to its surrounding physical environment.

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