On a tangent to this, I believed Pioneer were at the forefront of Sat nav technology in 2005 so bought an Avic S1 over £300 at that time.
Promises of updates for the software were only met once in 2006.
No updates followed that and despite numerous pleas by numerous other owners, Pioneer have in effect abandoned the unit which is now pretty useless with all the road mods and rerouting.
So as a previous 'Pioneer Fan' I have now abandoned buying anything else made by them, not sure how the software on the built in units is updated though but be careful as I know they are quite expensive!!