Tracking on GPS and DG don't match

**Centurion** · 09-03-2005, 10:38 PM

Hello all. I was wondering if anyone can tell me how to get the tracking heading on the GPS to match the heading bug on my DG. They are off by about 7 degrees. When I track say 130, I have to put the heading bug on the DG at 137 to follow the correct heading on the GPS. Anyway to get these two to match correctly?

Thanks

Monte

**baddadnv** · 09-04-2005, 12:18 AM

Hi Monte,

Crosswind! .... Your having to fly a heading of 137 to track 130.

Randy Burton

**JSPuonti** · 09-04-2005, 01:59 AM

It could also be the gyro drift in effect, if you've enabled that from the realism settings page. Pressing "D" resets the drift by default.

**brion_c** · 09-04-2005, 10:42 PM

Ditto Monte...
I have the same readings as you...and I have pressed "D", but the reading between GPS TRK and the indication on my DG is still dirrerent.
Is there something we're missing...Magnetic North/True North ???

brion...

**ladamson** · 09-04-2005, 11:47 PM

>Ditto Monte...
>I have the same readings as you...and I have pressed "D", but
>the reading between GPS TRK and the indication on my DG is
>still dirrerent.
>Is there something we're missing...Magnetic North/True North
>???
>
Use shift Z to check for any crosswinds. Also look at the ball on the turn coordinator to see if it's centered, and the plane isn't in a constant out of trim slip.

With no wind, no gyro deviation, and okay trim, the GPS track & DG should agree. Has nothing to do with differences between true & magnetic headings.

For instance, with a direct crosswind from the left at 8 knots, I get a 3 degree difference betweeen the DG & GPS, as the nose of the airplane is pointed slightly to the left.

Ladamson

**Centurion** · 09-05-2005, 12:48 PM

Thanks for all the good info guys. I knew I could count on the true follower of this site...

Monte

**brion_c** · 09-06-2005, 03:16 AM

Larry...

Right you are...should have checked both instruments on the ground...but...I set up a test flight this way:
DG indicates 360' and with the wind 090 @ 36, the GPS indicates 350'. With the wind 270 @ 36, the GPS indicates 010'.

I seem to be backwards...my nose seems to be pointing AWAY from the wind...

please help...need straightening out...