Two things Alberto.

FIRST.....DO NOT TURN THE DOPPLER NAVIGATION KNOB ON THE OVERHEAD TO REC ONLY/ON/TEST. It appears to be causing CTD's. Even more so IF you are using the INS as well.

Ok. I gave you the warning and that's now out of the way.

Secondly. On the lower front panel, in front of the Captains seat, is a switch that needs to be switched to INS. Open the cover and you will see it is set to DNS. As for the rest of the procedure with the CIVA-INS, you need to read the documentation that came with it. I'm still coming to grips with this too. It's a bit of hard work, but fun.

Mark