Magnetic declination is the angle between magnetic north (what a compass needle points to) and true geographic north. It varies by location and changes over time. The Untangled Labs Magnetic Declination tool calculates the local declination for any latitude and longitude using the NOAA World Magnetic Model (WMM), shows whether to add or subtract the value when navigating, and includes a Compass Correction Calculator with two real-time panels: convert a compass reading to a true heading, and convert a true heading to a compass bearing. Use GPS to auto-populate your current coordinates. Free GIS tool, no account required.
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