NigelOnDraft,
all correct as regards the stby instrumentation, however, GPS position, goemetric altitude and groundspeed info is all still avble on the GPS monitor page in the MCDU, although the last one may be blended with IRS info....i'm pretty sure the 320 bus has that facility- certainly the 330 and 340 bus' do. Rather useful page to have up on a dark and stormy night when it all goes black.