GFZ German Research Centre For Geosciences cooperates with and operates a number of geomagnetic observatories world wide. We have a strong emphasize on the operation of geomagnetic observatories in Germany (Niemegk, Wingst, Black Forest) and on a science-driven global observatory network. The letter concentrates on the South Atlantic Anomaly (Tristan da Cunha, St. Helena and co-operations in Antarctica, Brazil and Southern Africa), the equatorial region (co-operations Brazil, Maldives) and the polar region (co-operations Iceland, Antarctica). In the equatorial region, we investigate the equatorial electroject, a thermospheric wind and ionospheric dynamo related phenomenon. In the auroral region, we investigate magnetosphere-ionosphere coupling. GFZ also produces the international Kp index of geomagnetic activity and the new Hpo indices and actively engages with industry collaborations and data license activities.