Movable disc enables magnetic variation to be set on the instrument
Movable arm is divided into millimetres
Captain Field's protractor markings
Comfortably covers the largest Admiralty Chart
Pencil guide holes give precision loction
Unique design ensures a truly parallel action
Special slip and grip for ease of use
Manufactured from clear acrylic
400mm in length
EAN no: 05020027060264
Delivery from £3.95
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