Magnetic North Pole NW migration

If you use a flux-gate (heading sensor) to keep your chart/radar oriented to the bow of your boat or for your auto-pilot, I suppose over time the calibration could change. If/when that happens, you'd just need to go through the calibration dance. My Garmin MFD lets you apply an offset to the the data returned from the heading sensor.

As others have mentioned, the shift should not affect your GPS positional data.
 
“True Virgins Make Dull Company At Weddings”

When my Dad started teaching me how to fly 60+Years ago I recall that method of remembering:

True Heading +/- Variation = Magnetic Heading +/- Deviation = Compass Heading. Add West (or Subtract East). Or another way to remember to add or subtract is: “East is Least and West is Best”.

"Can Dead Men Vote Twice at Elections?"
 

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