Portland Navigation Plotter Single Arm 400 Ml

Blundell Harling – Made in the UK Portland Single Arm Plotter for chartwork and navigation. A simple system to add Variation or deviation onto a course plot. 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 loction  Unique design ensures a truly parallel action  Special “slip and grip” for ease of use  Manufactured from clear acrylic  400mm in length