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Polar routes

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EHM-1242 Stef:
Hello gentlemen,

Normally am trying to do things by the book and as per checklist. Anyway, even though wanted to switch over from MAG to TRUE (if i am not mistaken in the Boeing manual at www.smartcockpit.com it is written at 78 degrees North it should be switched) this was not required as the PMDG 744 shortly before reaching this latitude makes the switch by itself when it deemes necessary.

I don't think these things are realistic. Am a nautical officer by trade and, although we do not go THAT far north, a courseline is always displayed as a straight line on such short distances (fly my ND normally set to 40 nm range). Note also that even if it would not be, the curve would have to point the other way, towards the south due to the nature of the greatcircle.

My best guess as to what one sees in the above is that MS FS is feeding wrong positional information to the 'aircraft', causing all these strange courselines (unfortunately have just one pic... :[ )

As to the PMDG phenomenon:
Robert, ofcours i meant i was flying LNAV. Sorry, my mistake. All these abbreviations sometimes gets mixed up... VNAV is ok and has never caused any problems. On my system it just happens slowly: she slowly starts wandering ofcours, coming back, staying there for a while, wandering of again - bit further this time, coming back etc. Until a certain stage where she just wanders some 3,5 miles ofcours and banks hard for a full circle in the wrong direction (i let her go once over Australia). After this then all goes wrong... Just like she does not know anymore what the hell :@ she was actually doing!

One day i'll find a cure... until then just hope for the best. I dont know where to look anymore or what to try.

As to the compass readings: yep, fully normal because near the magnetical pole the magnetic field does not have a directional component anymore, just the vertical component remains (which pointing straight down/up). Check the picture: HDG 219, magn compass indicating some 055!?

Cheers

Stef
EHM-1242

EHM-1001 Robert:
Hi Stef,

it sounds for some reason the NAV hold mode gone crazy. Maybe your autopilot settings are not correct ? I tried to check autopilot settings but those are inside the AIR file coded for PMDG... did you use time compression maybe ? That have a bad effect on autopilot.

EHM-1242 Stef:
Exactlt my thoughts when i am observing it happen: "has she gone totally lunatic, or what!?!?"

Have talked about this quite extensively with my brother (Niels) as well because on his system this behaviour can not be observed. Have compared a zillion settings already (including switching off/on gyro drift and the likes) but all to no avail.

Nope, don't do time-compression. When i fly, i fly real-time. Also on my long distance flights.

Who knows, perhaps it becomes better now that i have the FS9 update for the PMDG B744 installed that came with the FSX version they recently released (one thing i do not understand from PMDG though: when there is an update to the current FS9 version, why not make it available for public download for the users who do not own/want the FSX B744???) Haven't flown the FS9 B744 since installing the update. Perhaps it has improved now...

By the way, since we were actually talking polar flights here: slewed around a bit earlier this evening (installed FS Global 2008 and wanted to check what the world looked like after this. Really an amazing difference such mesh-software makes!! Can really recommend it! And: I now have a northpole! ;D ) and the MS world ends at 89degr 30min North (guess same is South). You then run into a wall (literally!) and can go no further...

Thanks for trying to help out though. Much appreciated.

Aloha,

Stef
EHM-1242

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