VORs & Victor airways in FAA sectionals
Here's a question that nobody had an answer for so far, including several experienced FAA instructors and an FAA examiner.
I noticed a discrepancy when comparing the following magnetic tracks of Victor airways in FAA sectional charts:
a. The magnetic track of Victor airways as written in the chart.
b. The magnetic track obtained by measuring the angle between the compass rose and true North with a protractor.
Often these values are not consistent and in some cases deviate notably, i.e., by several degrees! Also, in some cases two nearby VORs deviate considerably in their variation: Their compass roses are not aligned and inconsistent with local variation, despite being between the same two isogonic lines.
Does anybody have an explanation for this?
Overall, this is a pity, since you'd obtain different magnetic track when planning a flight by measuring with a protractor, or by taking the track obtained from the VOR rose or the indicated magnetic Victor track for granted.
Also, what's the FAA policy for updating the magnetic orientation of VORs and Victor airways (if possible with reference)?
Last edited by Zonkor; 24th Jun 2013 at 05:29.