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ykalra
Q on compass rose

Hi!

 

Is the compass rose on the Skyvector charts in true or magnetic?

 

Thanks! 

mik
Compass rose, on sectional charts

Short answer:

At the time the VOR was installed, magnetic north.

If the question is for the purposes of an exam, refer to page 17 in the Aeronautical Chart User's Guide.

 

 

 

 

Long answer (optional details):

With time the magnetic poles drift, however VORs are not constantly updated. So the VOR radials become less accurate.

At a certain threshold, the VOR should be re-surveyed. In practice, VORs are not adjusted often and typically are not adjusted when they go down for maintenance.

So to be very precise, more precise than needed, then the magnetic variation of the VOR is published in the A/FD.

http://aeronav.faa.gov/afd/04feb2016/SE_front_04feb2016.pdf

Refer to page 24 in the A/FD legend, item 36 shows magnetic variation for the VOR. (8E in the legend's example).

 

By illustration, the CLT vor on the Charlotte sectional:

Refer to the A/FD (dated 04 Feb 2016) and it indicates a magnetic variation of 5W: http://aeronav.faa.gov/afd/04feb2016/se_261_04FEB2016.pdf

 

Note this is not the same as the isogonic lines showing variation on either side of CLT (7deg. West and 8 deg. West).

[The illustration is current for Feb 2016. At next publication date, the abv A/FD links may be obsolete.]

 

Hope this helps.

Mike