Mxsmanic wrote:
Steven P. McNicoll writes:

That would be true if VORs were set to local magnetic variation. They
rarely are.

Which variation are they set to, and how useful can they be if their
orientation doesn't match the local magnetic variation?

Because some were never right. Some where set right but the local
variation has changed and the VOR's were never realigned. It's
not necessary for them to set exact, just that they are known with
a reasonable precision. The fact that they are close to magnetic
north is again as we've been saying, convenience because all courses
and headings IN FLIGHT are done magnetic.