The latest release of International Geomagnetic Reference Field (IGRF-11) was published online at the end of 2009. IGRF is a standard reference model of Earth's internal magnetic field. The reference field is typically updated every 5 years by an international team of geomagnetic field modelers working under the auspices of the International Association of Geomagnetism and Aeronomy and in collaboration with institutions collecting and disseminating magnetic field measurements from satellites and a worldwide network of ground-based observatories.
As with earlier versions of the reference field, IGRF-11 provides a global picture of the past and present geomagnetic field as well as a linear prediction of field changes over the upcoming 5 years. IGRF is widely used in navigation and heading systems, geophysical surveying, and space weather modeling and prediction.