direct route gets disoriented

[2RIP]

I'm not sure if this problem is due to FSP or FS itself, but everytime i do flights that requires flying over Greenland(full of ice), the gps starts
to show up white smoke(clouds/or snow) on the screen. Then the aircraft start to bank on an angle and fly in circles... this continues forever and i
notice the heading will change by itself so my engaged autopilot will follow the orders to fly in circles

[captain_crunch]

Are you flying close to or over the north pole? Reason I ask is because I read somewhere that FS does not accurately model the shape of
the earth. It uses a kind of cylindrical projection for it's coordinate system which means it can't properly handle latitudinal transitions when
flying over the poles. This could easily explain why your GPS and autopilot goes crazy in this part of the world

[poden]

Well, it doesn't seem like it would be an FSP problem. You should at least fly that route without using FSP and see what happens (use time compression
to get the test over with quickly).As far as what would cause the problem in FS, I don't know.

Recently I did a test of FS flying at high latitudes, and the whole cylindrical projection problem didn't really pan out; the only odd thing about it
is the scale distortion seen on the map at high latitudes. You can actually fly very close to the pole. Above 89 degrees, accessing the map will cause
the display to kick out a non-fatal error saying it wants the latitude to be less than 89 degrees, but that's it. You can just close the map and
resume flying. It seems that the cylindrical projection is only used in the display of mesh terrain, and the actual flight dynamics are modeled on a
fairly accurate WGS-84 derived sphere.

Its unclear why it would go batty over Greenland. Possibly (but not likely) the proximity to the North Magnetic pole? Sounds like another test is needed!

[2RIP]

well it is a direct flight from CYVR to RJAA .. and now that you speak of it, its the most upper north of the planned route that starts to screw up
and fly in circles

[poden]

If you could find/add maybe a waypoint that deflects the flight path just a little bit southward, that might take care of the problem.

[the_nick]

recently I did a flight from heathrow , to somewhere in greenland and from there I went to Iceland, and I didn't had any problems with the
GPS or any other navigation instruments.