The evolution on the A320 ...
Unrelated to the GPS subject, but for instance the first 20 or so airframes did not had winglets. They were at BA and AF.
MSN 22 and 23, it seems, were the first to have winglets. They were at Ansett.
This aircraft had the normal Airbus logic of in case of Dual Imput on the yokes the resultant is the arithmetic sum of both imputs, but they did not had the advisory synthetic voice "Dual Imput". Don't know when it latter on became standard ...