A320 NAV discrepancy
as the nav mode engaged after takeoff i noticed a difference on the 1 FD 2 roll command.
Went on to compare the NDs to note a 0.4nm off track difference indicated (left ND centered right ND Off track).
GPS PRIMARY,
NAV accuracy high,
and NAV accuracy check = one degree off on the VOR needles vs fix bearing on progress page.
DME = to fix distance.
what is happening here? how to go about it?
is this supposed to happen in GPS primary ?
isn't the Kalman filter supposed to smooth out these things on our Litton referenced FMGS2?
thanks in advance you for your input.