1 PLOTTER AND DIVIDERS
Hold the dividers so you can open and close them with one hand, measuring distance at the side of the chart at the same latitude as your position. A Breton plotter can help take the mental arithmetic out of magnetic variation, but make sure it’s pointing the right way.
2 THREE POINT FIX
Plot your three position lines on the chart. In open water take the centre of any cocked hat as your
