Magnetic Declination (Variation) | NCEI - National Oceanic and ...
Magnetic declination (variation) calculator based on the IGRF magnetic field model. Estimates magnetic delination world-wide from 1900 - present.
Magnetic Declination on Map
What Is Magnetic Declination? Cosmos Plus! Magnetic declination is calculated using the World Magnetic Model WMM2020.
World Magnetic Model (WMM) | National Centers for …
Maps of Magnetic Elements from the WMM. Contour maps were created for each of the seven magnetic elements (D, I, H, X, Y, Z, and F) and for their secular variation (rate of change).
Magnetic declination - Wikipedia
Magnetic declination (also called magnetic variation) is the angle between magnetic north and true north at a particular location on the Earth's surface. The angle can change over time due …
World Magnetic Model 2025 Calculator - British Geological Survey
Use the tool below to compute values for the geomagnetic field and secular variation for a given set of coordinates and date. This calculator uses the World Magnetic Model as released in …
Magnetic Declination - ArcGIS
Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the …
Magnetic Field Calculators - National Oceanic and Atmospheric ...
Enter a street address, street name, or street intersection. For best results, include as much location information as possible with the street address in your search, such as city, state, zip …
Historical Magnetic Declination - National Centers for …
2023年6月2日 · As the earth's magnetic field varies over time, the positions of the north and south magnetic poles gradually change. The magnetic declination at a given location also changes …
Geomagnetic Field Models at NGDC | NCEI - National Oceanic and ...
Models of Earth's main magnetic field, including the International Geomagnetic Reference Field (IGRF) and World Magnetic Model (WMM).
Magnetic Declination | National Centers for Environmental …
Magnetic declination (sometimes called magnetic variation) is the angle between magnetic north and true north. Declination is positive when this angle is east of true north and negative when …