Hi there, looking for some info please. Got a Tom Tom Go 530 recently, old stock from Tesco. I like the FM transmitter and the in car bluetooth. Got a question about in car charging. When i sit the unit in the dock it sits perfectly in a small recess in my car dash. I then plug it in via a USB in car charger. What is missing though is that when i switch the ignition off, the unit does not power off despite me selecting power off when external power removed. Does anyone know if the unit should auto power off when used in the dock in the car or will it work only with the provided in car charger. I found a hack that allows the unit to stay powered on for more than three minutes when charging in the dock. Is there anything similar to have it power off when in the dock and external power removed. Thanks for any help