Is there a way to make a car face exactly north?

A while back I hit upon the idea of using screenshots and the Navigation app to get maps in image form, but I ran into an issue. First, the app rotates the map automatically so that the player marker is always facing straight up, with no way to lock it to straight north = north orientation as in some other/older games. So, I hit on the idea of going into the world editor, copying a flat-topped building, putting a vehicle on top of that, and moving the whole assemblage around, using overlap and the diagonal stripes of the background to "stitch" screenshots together. That's when the second issue arose - no matter what I did with the nodegrabber in game or the Rotate Snap function in the world editor, I could never get a car to face exactly north. It would always be some tiny fraction of a degree off, resulting in a minutely rotated map.

I could not find any function to manually set a heading.

Is there some way around this?

(EDIT: Never mind, I found it. Of course I'd find it after I posted a thread.)