A VOR was off by 5 degrees. List of problematic VORs?

[marsman20208043]

@Norman999933

as all VORs seem calibrated/aligned to the current mag var, not the historic value at the time of installation

Many of them are correct, and the avionics follow them correctly, at least for the G1000, G3000, G5000, and the weird narrow vertical Garmins in the SW121.

A few high declination examples, LittleNavMap vs WxBrief:

BOS:

LFV:

BTV:

@Norman999933

The one point I disagree with is that published courses are never amended. You are 100% correct in that the published course is the number of degrees from the stations 0° reference. If, over many years, the mag var for the site’s location changes by 5°, than the magnetic radial required to draw the same track over the ground now changes by a corresponding value. Whilst the 090° radial will always be 90° offset from the reference vale of 0°, the magnetic course required to fly from A to B will change over time. Given these are the values published on IFR charts, they are amended over time to ensure the published value will still provide the same ground tracking.

No. They don’t re-align the VORs over time. That would require changes to the physical equipment. The IFR charts specify the VOR radials based on the current orientation of the VOR at the ends of the lines, NOT a magnetic course. The VOR 0 degree radial orientation is the same as it was whenever it was last physically adjusted - 1965 for the case of EHK.

Once the physical VOR installation is in place, any additional magnetic variation over time is irrelevant.