It's incorrectly called "HUD" because traditionally HUD is a reflection on windshield and therefore is not easily viewed/understand directly from device.

Perhaps a better term for it is reduced display or "screensaver mode." It's used for long distance driving where next direction and map of area are not needed.

It's a UX and I made it for Nextgen Basarsoft a long time ago. Look at Pongo skin, it might have it.