TY JOUR TI Field geophysical complex for creating maps of the parameters of the Earth's gravitational and magnetic fields KW Earth's gravity field KW Earth's magnetic field KW digital zenith camera KW gravimeter KW magnetometer KW navigation charts JO Russian Journal of Earth Sciences AU Murzabekov, M.M. AU Lopatin, V.P. AU Bobrov, D.S. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences