【實用生產應用app】Magnetic Declination|最夯免費app

Magnetic Declination is the angle of difference between true North and magnetic North. For instance, if the declination at a certain point were 10° W, then a compass at that location pointing north (magnetic) would actually align 10° W of true North. True North would be 10° E relative to the magnetic North direction given by the compass. Declination varies with location and slowly changes in time.

Declination is calculated using the current International Geomagnetic Reference Field (IGRF) model. Accuracy for the declination is generally within 30 minutes (0.5 degrees) of arc. Users should be aware that several environmental factors can cause disturbances in the magnetic field, such as Solar disturbances.

Center the map on the point of interest and then press the check button in the application bar to display the magnetic declination at that point.

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