Navigational sailing equipment

Navigational sailing equipment

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Credit: JOHN MEAD/SCIENCE PHOTO LIBRARY

Caption: Navigational sailing equipment on a nautical chart. At left are some dividers, a pair of compasses for measuring distances on the map. In the centre is a Silva compass, for use in conjunction with the map for finding directions. It consists of a fluid-damped, magnetised needle fixed to a plastic ruler base. The needle becomes aligned to the local component of the Earth's magnetic field, resting North to South. At right is a parallel ruler, an instrument used, again in conjunction with the chart, to calculate courses.

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Keywords: compass, compasses, device, equipment, instrument, pair of, pair of compasses, science, scientific, silva compass, silva type

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