John Bell wrote:

The Garmin 196, 295, 400, and 500 series appear to correct for this
variation problem when the VOR is the active waypoint. The GPS III Pilot
does not.

The problem is that the VOR is aligned to magnetic north, but is not
realigned as the magnetic variation changes over time. Thus, this is really
a VOR problem. However, the GPS receivers that I mention compensate for
this.

Do you mean to say they compensate for the lack of realignment by using the
navaid's published "declination" instead of the actual alignment of magnetic
north? I am skeptical.

My understanding is they use an approximation like a best-fit polynomial or
similar to derive the magnetic declination at any given location.

Dave

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