Pontiac 2000 Bonneville Owner's Manual page 144

HUD shows these images when they are lighted on the
instrument panel.
The speedometer may display a difference of 1 mph
(1.6 km/h) from the HUD image. This is normal.
When the ignition key is turned to RUN, all possible
HUD images will come on, then the HUD will
operate normally.
2-80
If you never look at your instrument panel cluster, you
may not see something important, such as a warning
light. So be sure to scan your displays and controls and
the driving environment just as you would in a vehicle
without HUD.
NOTICE:
Although the HUD image appears to be near the
front of the vehicle, do not use it as a parking aid.
The HUD was not designed for that purpose.
If you try to use it that way, such as in a
parking lot, you may misjudge distance and
run into something.