Charts and Drafting Instruments
- Charts are maps of the areas to be navigated with details specific to the marine environment.
- Computing aids: used in the necessary mathematical calculations. Today electronic computers or calculators are used. Other traditional aids used included tables (trigonometric, logarithms, etc.) and slide rules.
- Dividers used for measuring lengths of lines and approximate lengths of non-linear paths on a chart.
- Nautical almanac used to determine the position in the sky of a celestial body after a sight has been taken.
- Parallel rules used for transferring a line to a parallel position. Also used to compare the orientation of a line to a magnetic or geographic orientation on a compass rose.
Read more about this topic: Navigational Instrument
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