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GPS and Compass 180 deg difference (Read 219 times)

May 15^th, 2011 at 2:39am

EVVFCX Offline
Colonel
Been there done it-well
most of it.
Pontefract, West Yorkshire

Gender:
Posts: 499

Hi all,

Thought I'd start having a go at the worlds 10 most dangerous airports.

Started at Lukla VNLK, switched on GPS with intention of flying out of the valley and return.

GPS is showing heading as being 180 less than (reciprocal )of runway direction, compass shows correct heading and so does Shift Z.

GPS's graphic of runway is also different to what I see.
Tower view is also 'miles' away.

There are graphical problems in this area anyway, I've not noticed this problem anywhere else before.

regards

Steve

May the Mynd be with you.
So far my number of landings either passenger or pilot equal my number of takeoffs, but that is due to change

13/07/11 Passed BMFA Fixed Wing 'A' test.
FSX Gold

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Reply #1 - May 15^th, 2011 at 8:35am

dave3cu Offline
Colonel
Procrastinate now, don't
put it off.
3CU, Northern Wisconsin, USA

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Posts: 3077

The GPS (in FS anyway) has no magnetic input so no sense of heading while standing still. It calculates the ~~heading~~ track by comparing GPS positions while moving.

It's not uncommon for it to disagree with the compass, when you start a flight, until you begin taxi.

**Corrected-I must pay closer to my terminology... Wink

« Last Edit: May 15^th, 2011 at 12:55pm by dave3cu »

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation. Igor Sikorsky

I intend to live forever....so far, so good. Steven Wright

You know....you can just rip up a to-do list.

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Reply #2 - May 15^th, 2011 at 9:00am

Brett_Henderson Offline
Colonel
EVERY OUTER MARKER SHOULD
BE AN NDB

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Posts: 3593

Quote:

The GPS (in FS anyway) has no magnetic input so no sense of heading while standing still.

No sense for heading while moving either.. the GPS deals with; direct-track (DTK) (if there's an active course/waypoint), and actual-track (TRK).

Heading (direction the nose is pointed), is of no use to the GPS.

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