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I’d want to use the screen for navigation and the camera for Dashcam at the same time

android auto

not sure if you're using iOS, but I already made one for iPhone.

https://apps.apple.com/us/app/dashmap/id1638360259

Good luck. As soon as you tilt the screen towards you so you can read it, your dashcam is now capturing video off at some weird angle.

I always have my phone screen off while driving since it's hooked up via Android Auto, but I've had my phone shut off many times on warmer days. I'm not sure how I could reasonably shield it from sunlight and use it as a dash cam at the same time.

Still won't be enough. Driving I-5 from LA to SF on a reasonably warm day (85+F) means the phone will shut down within the hour if it's on the dashboard. I've specifically gotten a phone mount that attaches to the AC vents for that purpose.

I appreciate the thought, but unless it works up to at least 140F, it won't be useful