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You probably don't remember these but I have a question
(lemmy.world)
This is a most excellent place for technology news and articles.
An iPod nano can't play over USB, you need to use the aux port
This is unfortunately the only real answer. “Install an aux port in your car, or get a different player that will play via USB” isn’t a good answer to hear, but it’s the correct one. Maybe use one of those FM transmitters instead. Reception will entirely depend on where you are, (and the FCC severely limits how powerful a non-licensed radio broadcast can be,) but at least it would get music to your car. Or if your car has Bluetooth, you can get one that takes the audio in via aux and outputs to Bluetooth.
But if you don’t have an aux port, I’m guessing you don’t have Bluetooth either.