Navigation Tools

 
A collection of instruments used in navigation during the 17th and 18th centuries


Product Image Item Name+ Price
Chip Log

Chip Log

A chip log consists of a wooden board attached to a line (the log-line). The log-line has a number of knots tied in it at uniform spacings. The log-line is wound on a reel to allow it to be paid out easily in use. When the navigator wished to determine the speed of his vessel, a sailor dropped the log over the stern of the ship. The log would act as a drogue and remain roughly in place while the vessel moved away. The log-line was allowed to run...
£80.00

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Cross Staff

Cross Staff

The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes moving over it. First described in about 1342 by the Jewish philosopher and scientist Levi ben Gerson and originally used for astronomical and surveying purposes, it became a mariner's navigational instrument in the 16th century (also known as 'ballastella', 'Jacob's staff ' or...
£250.00

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Mariners / Gunter's Quadrant

Mariners / Gunter's Quadrant

£80.00

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Max: 1