Okay... here is what the manual says:
"In the RETURN sub-mode, the sighting mark shows the glide slope intercept point. The
shortest line to the glide slope point will be indicated on HDD. Manual switching between
airfields is performed by pressing the [~] key. After reaching the glide slope intercept
point, the RETURN sub-mode will automatically switch to the LANDING sub-mode and
the Tower will provide landing instructions."
So when the submode switches to landing submode automatically the HUD should show the ILS cross right?