Summary
The direction of the geomagnetic field has changed substantially less in India than in Europe since the end of the 18th century.
Whereas the European geomagnetic time series indicate a tendency of secular variation from which a remarkable westward drift of the non-axial field can be deduced, in India the field direction seems to have remained more or less fixed over the last two centuries. The drift of the non-axial field seems to be very small, or even eastward.
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References
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Janáčkova, A., Urban, L. & Chmelař, M. Magnetic field measurements in India during the last two centuries. Stud Geophys Geod 36, 151–160 (1992). https://doi.org/10.1007/BF01614126
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DOI: https://doi.org/10.1007/BF01614126