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> It's also not clear what the purpose of this line of argument is.

It completely dismantles your previous goalposts, which were planted firmly on GPS:

>> Not with the necessary precision. GPS doesn't work in tunnels or parking garages and can be wildly inaccurate in city centers with skyscrapers blocking line of sight, for instance.

(I guess we all have the freedom to be as flexible with our goalposts as we wish. I didn't come here for a tireless argument that is motivated by nothing but the desire to argue, though. Have a great day!)

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My line of argument is "the head unit is responsible for not allowing video playback while in motion". Anything to do with detecting motion came after that.
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The point of argument is that it no longer becomes a security issue to allow customOS on the infotainment system because it absolutely has no connection to the engine computer.
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This is not an architectural issue. The threat isn't a bad OS causing the car to explode. This is a safety issue where the car is required to prohibit certain things - such as video playback.
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