Following on from my GND Alignment video, here we have the SEA alignment using the ships SINS data cable (Ship Inertial Navigation System).
Thanks to Shiftie_Mover for the advice about the QUAL Countdown before switching over the NAV or IFA.
Once again if there is an error in anything I've said please let me know in the comments, thanks.
![](https://i.ytimg.com/vi/58uWJ0JjRNE/mqdefault.jpg)