Advice re in-dash sat nav for Mazda 3?

[Brilad]

Hi all

I hope I am posting in the right place.

I will be swapping my golf for a Mazda 3 in the next couple of weeks, and at some point I would like to have a sat nav in the dash as I am a bit fed up with wires trailing about!!

Does anyone know of any probs with fitting a double din sat nav in these cars? I have heard it can interfere with the climate control. I would also like to use my ipod in the car...

Many thanks for any thoughts