Computes the Earth's current or historical magnetic field at a given location using the IGRF model. The magnetic declination computed is useful for compass navigation since it represents the difference between true north and magnetic north. Field inclination and total intensity are also computed which are useful for geophysics purposes. The input latitude and longitude are in decimal degrees and follow the usual conventions of -ve latitude being south and -ve longitude being west. This tool uses the International Geomagnetic Reference Field model (IGRF-11). See http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html for full details. Years from 1900 through to 2015 are supported.
Keywords: Magnetic deviation
1.15 Added short-cut to turn on GPS, Added tool bar buttons at bottom, Reduced number of decimal places shown.
1.14 Fixed issue with decimal separator in other locales, Prevented keyboard from popping up when app opens.
1.12 Made screen scrollable for use on small screens
1.11 Improved GUI appearance
1.10 Added copy to clipboard and added note to help about DMS and DM formats.
1.9 Renamed from "Calculate Magnetic Declination" (previous version had 1800 downloads and 4 1/2 star positive feedback)