Day Skipper training module 8 of 17
Use of parallel rulers, dividers, and proprietary plotting instruments.
You are preparing a real trip where your understanding of use of parallel rulers, dividers, and proprietary plotting instruments shapes the decision. Use this module to explain the cue, the risk, and the next safe action before you move on.
4 lesson sections · 18 quiz questions · 12 flashcards
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Accurate chartwork requires proper instruments. The three essentials are: parallel rulers (or a proprietary plotter like a Breton plotter or Portland plotter), dividers, and a sharp penci...
Parallel rulers are two hinged rulers that can 'walk' across the chart while maintaining a constant angle. Place the ruler along the line whose bearing you want to measure, then walk it t...
A Breton plotter (or Portland plotter) is a rotating protractor that sits directly on the chart grid. You align it with a meridian (N-S line) or parallel (E-W line) on the chart, then rea...
Dividers are used to measure distance on the chart. Open them to span the distance you want to measure, then transfer them to the latitude scale at the side of the chart (at approximately...
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