I'm using Tom Tom Mobile with the Nokia 6600 mounted on a Brodit clip and plugged into the cigar lighter. I tried using it without the cigar adaptor, but its impossible as it eats the battery!. You have to have power to the phone...........or you can expect no maore than 2 hours.
I think this is due to not being able to turn off the backlight on the 6600.
Decent piece of kit and far better than the BMW Sat Nav on my 330d. Far more compact than the ToTom PDA Sat Nav which I used prior to purchasing the TomTom mobile.
Black  MCS - Gravity - Eibach - 18 PACE - Road Angel 2! - TomTom Mobile Sat Nav |