HDG Fail and GPS ONLY

[ErixCZE]

On a flight over northern Greenland my heading seems to have failed and I have GPS only message on my PFD. Have I done something wrong or is this normal behaviour for such latitudes?

IRS seems to be monitoring position but I can get no TRK/SPD information out of it from the IRS STATUS page.

[ois650]

Hello, you may follow the below procedure 

[ErixCZE]

Hey,

thanks for the reply. Where did you get that FCOM/AFM? I assume you didn't find it somewhere on the internet, right?