Nice bit of kit. I can see this unit has effectively a 'mini FMC' built in. I still maintain that whatever 'updates' are available, only the derived positions are updated (via the Kalman filter) and not the platform alignment from which the root accuracy derives. Again, I suspect the OP problem was alignment positional data error or some sort of FMC computational malfunction to produce a common triple system error. It would be nice to see what engineers did as spanners asked