I too have wondered about this--I swore I've seen it in either real life or in a photo (OnStar nav on HUD), but don't think I saw it last time I had OnStar directions (no onboard nav).
Just checked the manual; on 5-26 it does say it could:
Quote:
The HUD may display different alerts and information for vehicles equipped with these features:
- Speedometer
- Tachometer
- Manual Transmission Gear (If Equipped)
- Manual Paddle Shift Gear Indicator (If Equipped); These displays on the HUD are for use when using the manual paddle shift controls to shift the transmission. See “Manual Paddle Shift” in Automatic Transmission on page 9-26.
- Shift Light; This light is used for performance driving to indicate that the vehicle's best performance level has been reached to shift the transmission into the next higher gear. An arrow pointing up will light up on the display just prior to reaching the engine fuel cut-off mode.
- G-Force Gauge Audio Information
- Upcoming Maneuver from OnBoard Navigation
- Upcoming Maneuver from OnStar
- Incoming Call
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