The 12th generation of the International Geomagnetic Reference Field (IGRF-12) was adopted in December 2014 by the IAGA Working Group V-MOD. It updates the previous IGRF generation with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a predictive secular variation model for 2015.0-2020.0. The IGRF model is defined by equations and spherical harmonic coefficients, and provides maps of magnetic declination, inclination, and total intensity for epoch 2015.0, along with their predicted rates of change for 2015.0-2020.0. It also updates the magnetic pole positions and discusses the latest changes and possible future trends of the Earth's magnetic field. The IGRF is a series of mathematical models describing the Earth's magnetic field from 1900 A.D. to the present. It is maintained by an international team under the auspices of the IAGA since 1965. The IGRF is used by scientists in various studies, including the dynamics of the Earth's core field, space weather, and local magnetic anomalies. It is also used by commercial organizations and individuals for orientation information. The IGRF model must be regularly revised to follow the continuous changes of the geomagnetic field. Each generation consists of three models: a definitive model (DGRF), a non-definitive model (IGRF), and a secular variation (SV) model. The DGRF is the most accurate and is used for the main field, while the SV model predicts the time variation of the large-scale geomagnetic field. The IGRF-12 model includes a DGRF for epoch 2010.0, an IGRF model for epoch 2015.0, and a predictive SV model for 2015.0-2020.0. The model is based on data from magnetic observatories, ground surveys, and satellite missions. The IGRF-12 model coefficients are available online, and the model is used to calculate magnetic field components at various times and locations. The IGRF-12 model provides maps of the magnetic field for 2015.0, including declination, inclination, and total intensity. It also provides maps of the predicted rate of change of these parameters for 2015.0-2020.0. The model also provides information on the positions of the geomagnetic poles and magnetic dip poles, and discusses the movement of these poles over time. The IGRF-12 model is available online, and the coefficients are provided in various file formats. The model is used by scientists and researchers for various applications, includingThe 12th generation of the International Geomagnetic Reference Field (IGRF-12) was adopted in December 2014 by the IAGA Working Group V-MOD. It updates the previous IGRF generation with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a predictive secular variation model for 2015.0-2020.0. The IGRF model is defined by equations and spherical harmonic coefficients, and provides maps of magnetic declination, inclination, and total intensity for epoch 2015.0, along with their predicted rates of change for 2015.0-2020.0. It also updates the magnetic pole positions and discusses the latest changes and possible future trends of the Earth's magnetic field. The IGRF is a series of mathematical models describing the Earth's magnetic field from 1900 A.D. to the present. It is maintained by an international team under the auspices of the IAGA since 1965. The IGRF is used by scientists in various studies, including the dynamics of the Earth's core field, space weather, and local magnetic anomalies. It is also used by commercial organizations and individuals for orientation information. The IGRF model must be regularly revised to follow the continuous changes of the geomagnetic field. Each generation consists of three models: a definitive model (DGRF), a non-definitive model (IGRF), and a secular variation (SV) model. The DGRF is the most accurate and is used for the main field, while the SV model predicts the time variation of the large-scale geomagnetic field. The IGRF-12 model includes a DGRF for epoch 2010.0, an IGRF model for epoch 2015.0, and a predictive SV model for 2015.0-2020.0. The model is based on data from magnetic observatories, ground surveys, and satellite missions. The IGRF-12 model coefficients are available online, and the model is used to calculate magnetic field components at various times and locations. The IGRF-12 model provides maps of the magnetic field for 2015.0, including declination, inclination, and total intensity. It also provides maps of the predicted rate of change of these parameters for 2015.0-2020.0. The model also provides information on the positions of the geomagnetic poles and magnetic dip poles, and discusses the movement of these poles over time. The IGRF-12 model is available online, and the coefficients are provided in various file formats. The model is used by scientists and researchers for various applications, including