R230 model changes 2002/2006

[urraco]

Hi

I'm aware of course of the major changes to the R230 SL range that came into effect in 2006, but can anybody please enlighten me as to the chronology of the minor refinements that took place prior to 2006. I'm referring to improvements such as the upgrade of the Satnav, the switch to a 7 speed box etc etc
I'm finally about to replace my beloved 2003 SL 500 written off last year and I would appreciate any info I can gather about the interior and other spec changes that took place between launch and the 2006 facelift

Thanks

[urraco]

Hi

I found out that for the 54 plate there was a facelift that involved an upgrade to a widescreen Satnav
I have a couple of questions plz

1- is this widescreen Satnav a DVD setup that can be updated with current road info or will I have to pay hundreds of pounds for an update?
2- what other changes were incorporated in this facelift?

Thx