WMM 2020 vs. WMM PAL Utilizzo e statistiche
WMM 2020 is targeted towards anyone interested in navigation. This includes, pilots of aircraft, captains of sea going vessels, cartographers, engineers and surveyors. Anyone who uses maps and a compass will find the declination calculation (also referred to magnetic variation) very useful. (Declination is the difference between true and magnetic north and used when plotting a course on a map.)
WMM 2020 (World Magnetic Model) calculates the magnetic flux density for any location on the Earth. The model is accurate for dates ranging from January 1, 2020 up through December 31, 2024. Using the model, the app calculates declination and inclination. In addition, the declination trend is calculated over the five year period.
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This App uses the World Magnetic Model developed by NOAA to determine the magnetic declination very accurately at any latitude, longitude and elevation of your choice, anywhere on the planet.
This App was originally introduced using objective-C tools and has now been upgraded with new features to Swift and SwiftUI tools.
There is a full built-in description in the App.
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WMM 2020 VS. 
WMM PAL19icembre d, 2024