FMC question

[aberkya]

This is B737 FMC question, I believe could be any FMC with MAN/SUPP NAV storage provision though.

A flight is to be conducted OUT of its electronic data base coverage. VORs are manually stored in the SUPP NAV DATA page.
Q. With the radios selected to MAN, does the FMC update its position using manually tuned Nav. Aid?
Note. The manually tuned VORs are the ones stored on preflight.

I appreciate your replies.

[Nightrider]

No, the FMC can only update with at least one selector in AUTO mode.

[BOAC]

Not my understanding, NR - the FMC will only AUTO-UPDATE blah blah blah, but will update just fine if it has 2 separate DME manually selected readings within the required angle spec. You could try choosing 2 in flight and go to manual on both and see the update.

So, in answer to the OP, yes it does, providing the stations have sufficient angular displacement from track. On the 737 you will need to enter the 4 letter type designator for the station as well to allow the system to use it in auto though.