Drift meter
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A drift meter, also drift indicator and drift sight, is an optical device used to improve dead reckoning for aircraft navigation by measuring wind effect on flight.
Douglas DC-6B drift meter in Finnish Aviation Museum.
Navigational instrument
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Navigational instruments are instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, dire
Drift meter
…were extensively used in World War II by bomber aircraft. Typically, fighter aircraft were not equipped with this kind of relatively sophisticated navigational equipment. For instance, in the Pacific Theater, where navigation was difficult due to scarcity of land or other prominent features, fighters were often guided…
An 18th Century Persian astrolabe – maker unknown. The points of the curved spikes on the front rete plate, mark the positions of the brightest stars. The name of each star being labeled at the base of each spike. The back plate, or mater is engraved with projected coordinate lines. From the Whipple Museum of the History of Science in Cambridge.