Declination results are typically accurate to 30 minutes of arc, but environmental factors can cause magnetic field disturbances. The calculator provides an easy way for you to get results …

Oct 21, 2025 · Click the same location shown on old maps and see how declination has changed over decades as magnetic poles drift. Understand global patterns by clicking across continents.

The magnetic declination calculator tells you the difference between true north and magnetic north at your location. We use magnetic declination for many applications, including navigation, …

Choose the geodetic/geocentric latitude and longitude either by entering the coordinates into the form below (decimal degrees may be entered into the 'degrees' field, and degrees S or W …

Magnetic declination is calculated using the World Magnetic Model WMM2025.

This page allows you to look up current values for Magnetic Declination and Grid Varience for any location. Then you can see what changes as you select various combination of north …

Calculate magnetic declination for accurate compass navigation worldwide. Essential tool for hikers, surveyors, and navigation professionals.

MagDec is a graphical front end for the NGDC online Magnetic Field Calculators that eliminates the need to input geodetic coordinates and displays the calculated magnetic declination and …

Click the "Calculate Magnetic Declination" button to get the magnetic declination in degrees. Positive values indicate east declination, negative values indicate west declination.

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