Wrong tracking on IRS? what am I missing?

[Hugo Weber]

Hello all, on the images attached, I read that my heading is 244, my tracking is about 236 and IRS shows 212. Am I reading this right? If so, isnt the IRS supposed to be 236 too?

IXEG 1.31 on XP 11.41

Thanks!

[mmerelles]

You need to know some new concepts.

 

-True heading (212 shown by the IRS display). This is the TRUE heading the aircraft is following in relation to earth's geographical north (not the magnetic north)

the difference between true vs magnetic varies across the globe, you may see isogonic lines/charts

 

-ND heading (244). The NAV display shows the heading the aircraft's nose is pointing in order to maintain the desired magnetic course 236. Since you have a VERY STRONG crosswind coming from the right, AP is pointing the aircraft's nose to 244 in order to compensate those strong winds trying to drift the aircraft out of desired 236 track.

if no crosswind components were present ND heading and planned magnetic course should match.

 

-Magnetic course. This is the magnetic course the aircraft should follow as per the flight plan.

 

hope this helps

 

 

Edited June 29, 2020 by mmerelles

[Hugo Weber]

Thanks a lot @mmerelles I checked out the WAC and saw that theres a 24 degree magnetic shift on the region I was flying. I added the 24 degree to the 212 tracking showing on IRS and in fact it gives the 236 magnetic tracking the ND shows.

[mmerelles]

you are welcome

 

happy flying