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The bigger screen is nice. The integration is also nice. I can push a button on my steering wheel to activate Siri to tell it where to go. Music controls on the wheel also pass through to CarPaly. I have a low res auxiliary screen to display added data (oil temp, weather, etc) and the music option will display music track data from CarPlay as well.

So instead of trying to look at a tiny screen that’s clipped onto an air vent, I can use the screens and integrated controls, keeping my hands on the wheel and my eyes more in the road.

Also, the biggest battery drain is having the screen on. CarPlay allows me to have the screen on the phone off while still accessing all the data. With a wireless adapter, I can also leave the phone in my pocket, so I don’t need to set it up every time I get in the car or remember to grab it when getting out. So it feels more like the native experience of using the car.

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With the exception of the screen size I can do all of that with my phone in a mount as well. But you shouldn’t be operating your phone while driving, not even with CarPlay. It’s illegal in many countries.
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Your phone in a mount provides integration with your car's steering wheel buttons to allow for control without taking your hands off the wheel? Your mount allows you to leave the screen on your phone off while also using navigation with a screen?

I don't know that I believe that.

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Exactly. You shouldn't be touching screens with your hands while you drive. That's illegal where I live. But my dash mounted phone has Siri and Bluetooth so I can be hands-free for commands and I can use the steering wheel controls for media.
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The car screen is much better, for me. Much safer, and less distracting.
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I’d rather have the map shown on the headunit screen rather than have the phone screen next to a larger but unused headunit screen.
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