Others will know far more than me re the manufacturer supplied sat nav options, but the slot is certainly not standard double DIN. It's far shallower I believe, and I don't think a standard double DIN headunit will fit.
Exactly correct. Narrower and a lot less deep. The little cubby on models w/o satnav gives an idea of the depth - and directly behind that is the heater.
A double DIN unit would extend into where the clock lives and stick out about 4".
