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By Webster A. G.

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Additional resources for Acoustical Impedance and the Theory of Horns and of the Phonograph (1919)(en)(8s)

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But if it were night or foggy, another ‘gung ho’ navigator would have ended on the rocks. 15 minute – about 300 metres (900 feet). Was this a datum error, a cartographic error, a vectorisation error or a GPS error? Who knows but it could have ended up as a shipwreck whatever the cause. Chart Scale Charts vary according to the area that they cover and hence the detail they contain. The scale of a chart is given as a ratio; one unit of length on the chart represents very many units of length on the Earth’s surface.

The variation at each rose may be different. • Place the edge of the parallel rule along the direction to be measured. • Open up the parallel rule until the other edge passes through the centre of the nearest compass rose. • If it wouldn’t reach far enough, ‘walk’ the rule across the chart until it reaches the centre of the compass rose, being careful that its direction isn’t altered. Magnetic or True Direction? All paper charts give direction in degrees true. You can convert these directions to magnetic if you wish.

With possible errors as large as 30 degrees, relying on an uncorrected steering compass can result in dangerous navigational errors. Prior to electronic navigation, steering compasses were routinely checked and adjusted, if necessary. These days many boat owners rely on the electronic element of their navigation to take them to their destination and never even consider compass deviation. Commercial vessels have their compass corrected by professional ‘compass adjusters’. Leisure boat owners can check compass deviation themselves and some ‘leisure’ compasses allow some simple form of correction.

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Acoustical Impedance and the Theory of Horns and of the Phonograph (1919)(en)(8s) by Webster A. G.


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