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An effective development of underground space is impossible without the use of modern systems of underground navigation. And the high-precision inclinometric survey is one of the main problems of such systems, as well as the complicated systems of drilling rigs, which are usually used in the construction of oil and gas wells. As a result of research described in the paper the authors scientifically prove a necessity of new special indices of geomagnetic activity introduction. Also the algorithm of their calculatio...