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A plotter is a computer vector graphic printer that gives a hard copy of the output based on instructions from the system. Plotters are widely used to print designs of things such as cars, ships and buildings on a piece of paper using a pen. Plotters are different than a printer in that they are more precise and they are most commonly used in engineering, where precision is mandatory. They are also more expensive than ordinary printers. A plotter is also known as a graph plotter.
A marine chartplotter is a piece of electronic equipment that shows, or plots, the boat's position on a nautical chart, allowing you to see where you are in reference to hazards, points of land, and everything else on the chart.ome handheld GPS units also are plotters, if they show the position of the boat on a chart. A GPS unit that provides the position only in longitude and latitude is not considered a plotter. For all types of plotters, the general principles are the same: 1  The screen shows a nautical chart.