i guess in the southern states tethering is not a big deal, but in the north snow belt states, it is a royal pita to have to remove your gloves, dig in your pocket for your phone, tether phone, put gloves back on each time you get in the car in the winter.
thus i prefer to just keep my phone in my pocket and just run from the HU without connecting anything. this is where my pandora comes in handy. battery drain is also minimal.
run heavy apps like on the op's HU, then the phone is going to need power.
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