On Apr 8, 2010, at 4:58 PM, David Megginson wrote:
> On Thu, Apr 8, 2010 at 2:00 PM, Peter Brown <smoothwater...@adelphia.net>
> wrote:
>
>> I see. So that brings us back to magnetic vs true, as I was originally
>> referring to. But, that's somewhat irrevelant as it _appears_ the mpmap is
>> sourcing the data from the actual runway placement. My opinion is there
>> should be an data file with the correct info to be displayed, and it seems
>> logical for it to be the navaid file, but we'd need to add a line if they
>> want to keep the true heading.
>
> Again, I haven't used mpmap, but are you certain it is trying to
> display an ILS localizer, and not just an extended runway centreline?
> You're right, of course, that it might have messed up true vs.
> magnetic (especially if the developer was working somewhere with very
> little magvar, and wouldn't have noticed during testing). Our files
> list actual runway headings in degrees true as well, so the only thing
> I can think is that the developer just took the runway *number* and
> converted it to a heading.
>
>
> All the best,
>
>
> David
>
No, I'm not sure of any of it. I was thinking I had posed it as a question
whose answer was readily available - I wasn't trying to debate it if that's how
it came across. I like functionality that the majority of users find useful,
since I classify myself as one of those. :) My guess is that as Martin said,
he/she probably is grabbing data from the navaids file.
To show you what mpmap provides, here's a few links. Note the two heading info
boxes when you have the ILS beam on - as if to display "Runway heading" and
"Approach heading", since the first info box also lists the runway number, ILS
CAT #, and GS degrees.
http://s512.photobucket.com/albums/t325/barefootr/?action=view¤t=Screenshot2010-04-08at50447PM.png
http://s512.photobucket.com/albums/t325/barefootr/?action=view¤t=Screenshot2010-04-08at50447PM.png
http://s512.photobucket.com/albums/t325/barefootr/?action=view¤t=Screenshot2010-04-08at50518PM.png
Thanks,
Peter
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