From: Peter B. <smo...@ad...> - 2010-04-08 21:15:28
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On Apr 8, 2010, at 4:58 PM, David Megginson wrote: > On Thu, Apr 8, 2010 at 2:00 PM, Peter Brown <smo...@ad...> 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 |