GMC 1999 Envoy Owner's Manual page 107

Reading Lamps
The lamps can also be swiveled to point in the
desired direction.
Press the button near each
lamp to turn the reading
lamps on and off.
Driver Information System
This system displays the outside air temperature,
compass direction and trip information in the
overhead console.
US/MET: The US/MET (United States/metric) button
allows you to switch the display between the English
and metric system.
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