Product Description: The GPS Plotter is a straightforward and effective interface between a GPS and a paper chart. It enables the latitude and longitude obtained from a GPS to be quickly, easily, and accurately plotted on a paper chart in a simple two-step maneuver. It does this with its innovative straight-line action and its special pencil guide holes. The instrument features protractor markings so that it can also serve as a conventional-style plotting device and parallel rule. Designed and manufactured in England, the GPS Plotter is made in a sturdy, clear acrylic for maximum chart visibility, and in one size to cover all chart sizes. It also has an innovative slip and grip feature that helps improve accuracy. Dims: 4-1/4" x 16".