The Portland Course Plotter is one of the most popular chart work instruments and is widely used by RYA practical & shore based instructors. It provides a quick method of plotting course and bearings and gives a direct reading of corrections for magnetic variation. This new version has been developed in consultation with the RYA and has been engineered for both strength & fine accuracy. Used worldwide by practical and shore based instructors Bright blue directional arrow prevents accidental reciprocal bearings Edges are graduated for tide and boat speed Base has a fixed grid so it is easy to plot latitude from your GPS system Includes a 7″ Single Handed Divider Comprehensive instructions included