With WindPlot connected to a radar that is putting out a NMEA 0183 sentence containing $RATLL and $RARSD, these sentences provide the radar cursor's position information in Latitude/Longitude and targeting. When the user places the radar cursor on a target on the radar screen and pushes the radar's target button, a mark is made on the plotter. With several of these marks made, as the ship moves a track of the foreign vessel can be made by linking the marks together.

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