DSC 22_30-10 Guidance modes show that it is managed! As Villas has already described above.
The A306 had localizer inertial smoothing to help the capture and tracking. It was an option which my airline didn't specify and it left the localizer susceptible to deviations .I would imagine that this function is incorporated into the fmgc in the A320 family and why there is a caveat about low accuracy.
Last edited by tubby linton; 24th January 2017 at 21:21.