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Start point heading error

L

Lear45Guy

Messages
5
Country
england
Hi all,

Has anyone tried placing the aircraft at a start point - as defined in the BGL data.

Using data extracted using BGLANALYZE.EXE I can use my program to place the aircraft at the start point defined in the BGL data.

BUT.

The aircraft heading is usually a few degrees off - maybe up to 3 degrees.
Sometimes its bang on - but usually there is a small but significant error.

If I then use the 'Goto Airport' menu option to place the aircraft at what should be the same start point it ends up on the correct heading - straight down the runway.

YES I AM APPLYING MAGNECTIC VARIATION CORRECTLY TO THE TRUE HEADING GIVEN IN THE BGL STARTPOINT DATA.

Sorry to shout but this is not a case of not apply magnectic variation correctly - I have tried in locations all over the globe with mag var values large and small - and I always end up no more than 3 degress out on the heading - but it is still not correct - but the 'Goto Airport' start point is !
Is FS applying someother correction to the heading that I don't know about (compass deviation ?).

Anybody tried this had similar results ?

Really tearing my hair out.

Be grateful for any input on this...

Rob
 
I did a quick try :
- setting variables PLANE LATITUDE, PLANE LONGITUDE and PLANE HEADING DEGREES TRUE, all with degrees units and double precision data;
- using start point coordinates and heading obtained with scruffyduck's SDE, with 6 decimals;
- don't bothering with magnetic variation.

And the result was pretty accurate. So the error is somewhere else. Maybe a degrees-radians conversion error (using 3.14 instead of 3.1415926...)
 
Thanks for the quick response.

I changed from using 'PLANE HEADING DEGREES MAGNETIC' to set the heading (and applying the Mag. Var. for the airport) to using 'PLANE HEADING DEGREES TRUE' directly and that works exactly correctly - straight down the runway.

Many thanks for getting my brain moving in a different direction.

Rob.

'Sometime you can't see the wood for the trees - but what the hell is your airplane doing in a forest anyway'
 
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