Normally I turn INS into CV/GND (depend on airfield or carrier spawn), then wait for 90s for alignment, then switch it to IFA. But last time when I switch to IFA (after 90s, "ok" display in hsi), the left ddi display "INS ATT" advise, then after 20s, hsi say "ok" again, "INS ATT" gone in left ddi. But, the hsi still counting time, also doesn't have the "auto" soft button. that mean it wont switch waypoint automatically. I really dont understand. thanks