B737 Fmc
In POS SHIFT page (for updates with dual FMC), which line is it that represents the FMC System position? I understand there is an FMC-L on LSK 1L and FMC-R on LSK1R, so does that imply that two FMCs will obtain the Best position which will then be used to correct the FMC System position?
Also, in the POS SHIFT page, a bearing and range is shown for a particular sensor from the FMC System Position. Now, how do I know what is the exact FMC System Position?
How do we know from the POS SHIFT page, that an FMC nav error has occured and to which sensor should we shift the FMC System position to?
Thank you very much for helping me out.