WebMaximus Posted January 10, 2012 Share Posted January 10, 2012 Like the subject says, I've noticed on several (most) flights that the inbound course for ILS approaches is different by one or a couple of degrees looking in EFB and the PMDG NGX FMC and I can't see why this is since they both use the same Navigraph AIRAC data - wouldn't that be a garantee they should be the same? And how do I know which one of them are the correct one? Until now I've been using the course in the FMC which has been working fine so far but it's a bit confusing with different values. Link to comment Share on other sites More sharing options...
jackharpenden Posted January 11, 2012 Share Posted January 11, 2012 Richard, EFB uses FSX's data for Aerodrome charts and approach charts, as opposed to various aircraft's use of AIRAC data. - This means that what EFB displays is FSX's actual situation, e.g. the scenery and magnetic variation in FSX will likely be out-of-date for many aerodromes and the EFB approach charts will reflect the actual frequencies and courses. Also if an airport has an added ILS which your scenery doesn't include, then this ILS will not show in EFB. Overall if you want to fly the runway's actual course as it is in FSX then fly what EFB lists, rather than what the AIRAC gives, as this is what the situation is at the RW aerodrome, which often won't be correct for your FSX scenery. Thanks, Jack Link to comment Share on other sites More sharing options...
WebMaximus Posted January 11, 2012 Author Share Posted January 11, 2012 OK, thanks alot for the info - good to know! About the Navigraph AIRAC data for EFB, is that only for SIDs, STARs and navigational waypoints then? Link to comment Share on other sites More sharing options...
GG_Flyer Posted January 11, 2012 Share Posted January 11, 2012 The way I like to think of it, if it's tangible (a runway, a transmitter) it comes from a BGL. If it's ephemeral (a procedure, an airway, a transition altitude) it comes from the AIRAC-derived dataset. Link to comment Share on other sites More sharing options...
WebMaximus Posted January 11, 2012 Author Share Posted January 11, 2012 That's a good way to think of it! Link to comment Share on other sites More sharing options...
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