AIRBORNE GEOMAGNETIC SURVEYS BY THE UNITED STATES HYDROGRAPHIC OFFICE

Henry P. Stockard

Peer Reviewed

Abstract:	The need for accurate worldwide geomagnetic data has long been recognized. At the present time, the magnetic information appearing on many nautical and aeronautical charts, especially those of the ocean areas, is based on old data which have been corrected for the long term secular change of the earth’s magnetic field. Since the secular change is very irregular and its accurate prediction is impossible, the reliability of this information on some charts has depreciated to such an extent that new surveys of the affected areas are urgently needed. An additional need for geomagnetic data has been established in recent years by special defense programs such as ship degaussing, magnetic guidance, and antisubmarine and mine warfare. In order to acquire this muchneeded data over the ocean areas, an airborne geomagnetic survey program, designated Project Mupet, was established at the Hydrographic Office in 1951.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 4, Number 8
Pages:	320 - 323
Cite this article:	Stockard, Henry P., "AIRBORNE GEOMAGNETIC SURVEYS BY THE UNITED STATES HYDROGRAPHIC OFFICE", NAVIGATION: Journal of The Institute of Navigation, Vol. 4, No. 8, 1955, pp. 320-323.
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