Changing the Nav voice is a bit fiddly. I did it with V25. I changed the female USA voice to the female UK voice. I'm originally from the UK .. so this is what prompted me to do the switch in the first place .....

I followed the instructions here (its for the mini, but its pretty much the same as the BMW I-Bus NAV system).

http://www.northamericanmotoring.com...ad.php?t=35168

But I notice for V25 at least the file structure was a bit different. These were the changes I made:

Follow his instructions but note the following.

So navigate to the
V_2/Voices/0502

rename usa_f.csf to usa_f.bak
rename gb_f.csf to usa_f.csf

V_2/language/0103

rename usa4f.tsf to usa4f.bak
rename gb4f.tsf to usa4f.tsf

AND

V_2/language/0105

rename usa4f.tsf to usa4f.bak
rename gb4f.tsf to usa4f.tsf

I've have loaded V26, but not looked at the structure yet, so it may have changed again. I should point out that for V25, in the end, I switched back to the USA voice, as I found the UK voice although fun didn't always prompt you at the correct time ... and just seem weird at times.

Cheers