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AFAIK, and I could be wrong (though I did google this first), plugging your phone into CarPlay does not use the car’s gps unit. That’s just your phone trying to find a road because it’s connected to a car. Even if you are getting the car’s gps, it’s not going to give you raw values, but display values to show in an app, which should be smooth, IMHO.

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https://discussions.apple.com/thread/250076351?sortBy=best

> If your vehicle has wireless CarPlay, the iPhone's GPS chip is completely ignored.

> If your vehicle has wired CarPlay, the iPhone's GPS chip may be ignored, depending upon what the head unit tells the phone to do.

this happens when near roads or not. the truck is doing something weird and wrong with the GPS data and forcing the phone to use it

No, it does use the car's GPS unit if it's provided to the phone. Which is why I started this thread by saying it did.

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