Maker & Reference
Magnetic Declination Converter
Compass needles point to magnetic north, not true north. Declination is the angle between them — varies by location and date.
True bearing
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- Magnetic bearing
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- Declination direction
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- Formula
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FAQ
Where to find local declination? +
NOAA: ngdc.noaa.gov/geomag/calculators/magcalc.shtml. Map shows current isogonic lines and changes by year.
Why does declination change? +
Magnetic north pole drifts ~25 miles per year. Maps over 5 years old should have declination rechecked.