Fig. 12From: Investigation of geomagnetic reference models based on the Iridium\(^{\circledR }\) constellationGrid variation north (GVN) (left), grid variation south (GVS) (center), and total field (F) (right) error plots for Iridium models, quasi-definitive observatory model, Swarm 2018 model and WMM 2015. MIL-PRF-89500B is the WMM specificationBack to article page