Plot 53º20’N 009º50’W, draw line from CON through that position and draw
line from SHA through that position. Centre protractor on CON and
align with magnetic north (use airway B1 113ºM radial); note radial
(235ºM). Centre protractor on SHA and align with magnetic north
(use airway G1 115ºM radial); note radial (325ºM).