Blundell Harling Portland Navigation Plotter

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The Portland Plotter is one of the most popular chart work instruments and is widely used by RYA practical and shore based instructors. It provides a quick method of plotting cours es and bearings and gives a direct reading of corrections for magnetic variation. Single arm plotter with variation scale for use on small or medium vessels and for instructional use. Movable disc enables magnetic variation to be set on the instrument Movable arm is divided into millimetres Captain Fields' protractor markings Comfortably covers the largest Admiralty Chart Pencil guide holes give precision location Unique design ensures a truly parallel action Special “slip and grip” for ease of use Manufactured from clear acrylic 400mm in length Show more