I always wondered this one. A good example of my question is the BVR VOR east of Denver Colorado. Why is it that if I plot a true course on my TAC and apply the 8.5 degrees E magnetic variation, it does not exactly parallel the VOR 360 radial. I picked BVR because it is very close to the 8.5 E isogonic line on the chart. Another way stated, why isnt the VOR arrow on the compass rose on the TAC 10degrees off from the nearest lat/long lines instead of 8d30m (8.5 degrees) as showed for magnetic variation.
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