Arrow points up, map is displayed with a slight perspective.

If there is no perspective, then at the very least, the car is about halfway between the middle of the screen and the bottom of it. I care far more about what's in front of me than what's behind me.

What I really hate is that the nav in my Tesla will typically show a perspective view while navigating, but as I approach a turn, it changes to a top-down view and zooms in, often to the point where the actual turn is no longer even on the screen, so I don't know where I'm actually supposed to go anymore.

Ouch! Whatever representation you agree on, the one thing you don't do is changing everything and throwing the driver out of their context at random.

And that applies to high-level apps (like a spam phone call) stealing the screen too.