It shows the speed all the time. It shows the turn direction, distance to turn, and street when navigation is on. It works well in daylight. The only caveat is that you can't wear polarized sunglasses.
It seems odd that BMW HUDs would polarize the light. GM HUDs work fine with polarized sunglasses. Visibility on mine was good except when driving on light colored roads (low contrast) in bright sunlight.
I think that's how they got theirs to work well in daylight. My guess is that the area in front of the HUD on windshield has a reflector that only reflects light of a certain polarity. It might still work with some polarized glasses as long as the polarity matches. If I tilt my head, it looked fine... hehe
Seems pretty distracting to me - the "upcoming vector" seemed way too jumpy and kept puling my eye from the road. Surprised it's even legal with that level of detail.
