برنامه محاسبه انحراف مغناطیسی + راهنمای آن

Declination is calculated using the most recent World Magnetic Model (WMM) or the Inteational Geomagnetic Reference Field (IGRF) model. For 1590 to 1900 the calculator is based on the gufm1 model. A smooth transition from gufm1 to IGRF was imposed from 1890 to 1900. Declination results are typically accurate to 30 minutes of arc, but environmental factors can cause magnetic field disturbances.