The coordinates of Sitka airport written in the right format are:
N57 02.5    W135 21.4
Switch STBY on the MSU panel and enter the coordinates after that switch ALIGN.
When the API reaches 06 if your ramp position insertion has been right the align will proceed to further APIs.
Gianfranco

When you switch the MSU to STBY the INS starts to make the controls and settings to alignment. At API6 if the INS hasn't yet received correct ramp coordinates stops his procedure waiting for the ramp position.
The ramp position insertion is different from a waypoint position insertion.In fact the ramp position insertion(MSU selector on POS) is constituted by the LAT&LON data insertion.During a waypoint insertion(MSU selector on WAYPT) the LAT insertion is indipendent from LON insertion. For this reason when you insert the ramp position after the LAT insertion the light INSERT remains illuminated waiting the LON insertion.When the INS has received also the LON coordinates the light INSERT goes off.
During the waypoint insertion the light INSERT goes off after having received the LAT data or the LON data.A common error during the ramp position insertion is pushing twice the INSERT button after having inserted the LAT data because the INSERT light still on.After having inserted the LAT it's normal that the INSERT light remains on and You have not pushing the INSERT light again.
Gianfranco

hello,
there are two possibilities:
1-ramp position has been inserted with an incorrect latitude.When ALIGN position has been switched the code 04-45 appears not clearable.

2-ramp position has been inserted correctly but the inserted position differs from the last computed and momorized inertial position at previous shut down more than3+3T NM.T is the flight time.
Being T=0 the inserted position must be within 3NM.3NM are useful to move during transit the plane in the airport area.
In this case the code 06-41 clearable appears.
Cheers Gianfranco