The only way possible to do what you want is to use the Bluetooth audio output option the device supports in speaker preferences, you will need a car stereo that supports A2DP Bluetooth audio or use an external kit such as the iO-Play device I have installed to my car - works great with the TomTom and the Mobile phone, even the handsfree calls are routed through the car speakers (something you cannot do with a TomTom) - Mike
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