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Techniques developed for the reduction and analysis of terrestrial satellite magnetic field data are used to better understand the magnetic field observations made by Mars Global Surveyor. A global distribution of radial (B_r) magnetic field observations and associated uncertainties is inverted for an equivalent source magnetization distribution and then used to generate an altitude‐normalized map of B_r at 200 km. The observations are well‐represented by a potential function of crustal origin, consistent with a remanent origin for the Martian magnetic features. The correlation between the 40546 B_r observations and B_r calculated from the magnetization solution at observation locations is 0.978. For a magnetization distribution confined to a 50 km layer, calculated magnetizations range from ‐22 to +17 A/m. We see correlations with tectonics that were only hinted at in earlier maps. Magnetic features appear to be …