On Thu, Apr 8, 2010 at 11:32 AM, Peter Brown
<smoothwater...@adelphia.net> wrote:

> David, yes, as I have as well.  The localizer for 33 as you listed above is 
> on a 326 heading per the approach plate, but the mpmap shows ILS data as the 
> runway heading in degrees - as if for users to use as the ILS data.  I'm not 
> sure what the 342 in the navaid file is referring to unless it's 
> elevation?... elev. is 335, course is 326.  (ref: 
> http://flightaware.com/resources/airport/BTV/IAP/ILS_DME+RWY+33/pdf)

The plates give the heading in degrees magnetic; the data file gives
it in degrees true.  That's still a degree off (BTV is 15W, IIRC), but
it's pretty close, and nav.data.gz may be based on old data.


All the best,


David

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