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Abstract When calculating the main field using the international geomagnetic reference field(IGRF) model, the height above the mean sea level, instead of the geodetic height, is utilized and the corresponding indirect impact of the geoid undulation is often ignored. Through global practical computation, the results show that neglecting the geoid undulation will introduce the errors of -2.37~1.59 nT, -0.51~0.33 nT, -1.95~2.09 nT, -2.37~1.59 nT, and -2.39~1.82 nT for the north, east, vertical and horizontal components and total intensity of the main field on the Earth’s surface, respectively.
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