There are basically two parts: Navigation OS and the Map Disc.

Feel free to call it what you want, but since it is the Navigation Operating System and the user does interact with it, it is more software than it is firmware.

__________________
Jeff
Current:
'07 Jeep Wrangler
'06 BMW X5 3.0i

Former:
'12 WRX; '08 WRX; '06 BMW X5 4.8is Dinan S1; '02 BMW 530i Dinan S2