"Ron Natalie" wrote in message
m...

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.


If they were set to true north they would still be known with a reasonable
precision. They'd be no less useful and they wouldn't have to ever be reset
due to magnetic drift.