Bulletin of the National Speleological Society - ISSN 0146-9517
Volume 28 Number 2: 70-79 - April 1966

A publication of the National Speleological Society

Cave-to-Surface Magnetic Induction Direction Finding and Communication
Royce E. Charlton, Jr.


Wireless communication between cave and surface is now practical by the use of transistorized magnetic induction equipment. The equipment also has directional characteristics which are particularly suited to cave-to-surface correlation in the more complicated cave systems. Accuracy of cave maps can be checked, proximity of adjacent caves determined, and depth of overburden can be measured. The feasibility of digging artificial entrances or re-excavating collapsed entrances can be determined. The equipment is within the construction capability of anyone with electronic construction experience.

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