MarkerInbound, englishal:
I agree with both of you, but it appears we are talking about different things. My main point is:
Problem
If you are flying a VOR radial that you
measured from an FAA sectional chart
with a protractor (as many do and are taught ground school) then
you'll be actually flying on a different track than you're thinking. This is due to the VOR variation discrepancy mentioned by MarkerInbound above, which seems to result in a deviation of several (three?) degrees, resulting in a small but unnecessary
systematic navigation error.
Solution
The (only?) proper way to avoid this issue is to
read the radial from the VOR rose. (Since this rose is rather small on the chart, it's not easy to get an accurate reading.)
I hope I made myself clearer now.
