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All iPhones and iPad's charge with a USB cable. Everybody knows that. What moest people don't know is that it's a bit more technical then that. Every USB port has an electrical voltage of 5 Volts. The voltage of a electrical socket is in Europe 230 or 240 Volts, in America it is (i think) 110 Volts. In a car there is a voltage of 12 Volt. An adapter (charger) will convert a higher voltage to the 5Volt needed for the USB-port. Now i did talk about voltage, but not about current. The current is the amount of electricity running through the device. An old ipod can charge with a current of about 700mA (milli Ampere). Newer iPod's and all iPhone's need 1000mA (or 1A = 1 Ampere). An iPad needs even more. The largest component inside an iPad is the battery. It would take too long to charge this large battery at 1000mA (1A) so it needs 2100mA (2,1 A). If you check the label or the printed information on your FM-transmitter you will see the Ampere rate will we too low, and that's why your other devices won't charge. I suggest you to go to a store and buy a compatible charger or FM-transmitter.
You don't need a usb port for mp3 playback, simply burn some mp3 files to a cd - not like an audio cd but a data cd (drag and, drop and burn the same way you would burn pitures to a disk) you will find that you can fit 5-10 whole albums on one disk. Enjoy & good luck.
1: Update to latest firmware from tomtom, for Gox20/x30 that is 8.351
2: Make an silent mp3 file and put that onto device
3: Play silent mp3 in loop
4: Send nav instructions over fm to radio... et voila!