As you all know, 1.1.0.8 is introducing the HARS correctly being the default Navigation Mode when doing a ramp start. It was EGI mode previously.
With the HARS mode active, you will not get any FPM/VVI in the HUD, and you will not be able to arm the EAC.
If you switch from HARS mode to EGI mode after complete INS Alignment, then the FPM/VVI returns, and you can arm the EAC.
__________________