Only tried with a GPS ‘phone :
Trek buddy on your ‘phone and mobile atlas creator on your pc to create the maps.
This allows real time positioning on a loaded map and the marking of waypoints to follow a route on the map.
All of UK available in O.S. mapping on mobile atlas, you just select the area and scale/size required, create your map and store to phone.
Italy – not sure but certainly open source maps or similar are available.
Or try gvSIG, a ‘phone app which can download its own maps via GPRS/Wifi, again, Italy is certainly covered by open source maps, not sure about any other mapping.
Neither requires maps to be calibrated, its all already done, though you might have to alter GPS settings to the Italian standard if I remember correctly.
Have you actually found some decent mapping of Italy to scan ??!