i have tested on Nokia 6600-6630-6680-N70:

TOMTOM MOBILE 4 with map 3.90 italy

TOMTOM MOBILE 5.20 with map 6.60.1223 italy

ROUTE66 MOBILE 7.0.1075 with map italy edition mar 2006

NAVIGON 6 MOBILE with map italy (post the map in MMC\navigon\maps\italy.map)
dimension map 236 MB
dimension map 194 MB

GPS: RoyalteK RBT-1000
MMC: Kingstone 2 GB

EXCELLENT PRECISION, witch software navigation i prefer tomtom mobile 5.20 is very nice, very good and on this sw you can insert continuos pOI's update