Free-air gravity anomalies based on filtered SEASAT altimetry data have been calculated for a 15-minute latitude- longitude grid by the International Gravimetric Bureau (BGI) of France. Gridding computation was by the inverse Stokes operator method combined with a high-degree and order spherical harmonic model of the gravity field based on the SEASAT and GEOS3 sea-surface altimetry. Users can order subsets of data by e-mail .