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Magnetic Inclination and Intensity

Dynon's EFIS products require you to input your local magnetic inclination and intensity as part of the magnetic compass calibration. To determine these values at the location where you'll be doing the calibration, follow these steps.

Note that this procedure only needs to be done once, prior to magnetic calibration; moving the aircraft to another location does not require repeating this procedure.

Visit the Magnetic Field Estimator at the Geophysical Data Center run by the NOAA (http://www.ngdc.noaa.gov/geomagmodels/IGRFWMM.jsp).

  1. Enter the approximate latitude, longitude, and elevation of your home airfield (the page can also calculate latitude and longitude from a U.S. zip code—note that some zip codes do not work; check the lat/lon output by zip code calculation to make sure it looks close to your location and isn't all zeros).
  2. Click the "Compute Magnetic Field Values" button.
  3. In the table of results, you will see a box labled "Inclination", displaying an angle and degrees in minutes (e.g., 69° 29')
  4. Round the inclination angle to the nearest 1/2 degree (30' = 0.5°), and enter it into your EFIS product via SETUP > MORE > MORE > MAGINC.
  5. In the table of results, you will see a box labled "Total Field", displaying a value in nT (e.g., 54,680.0 nT)
  6. Round the intensity value to the nearest tens digit, and enter it into your EFIS product via SETUP > MORE > MORE > MAGINT.