GMC Hummer H3 2008 Owner's Handbook Manual page 113

Instrumentation and Controls
Compass Operation
To turn the dual display on or off,
press and release the
The compass reading will appear
in the window at the upper right
corner of the mirror face.
As you are driving, N (North), NE
(North East), E (East), SE (South
East), S (South), SW (South West),
W (West) or NW (North West)
should appear on the display to
show your vehicle's direction.
If the reading does not appear
after about five seconds or if C or
CAL appears on the display while
driving, the compass may need
calibration.
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There may be a strong magnetic
field (from various magnetic
objects on the vehicle) interfering
button.
with the compass.
Remove these objects or ask your
dealer for assistance.
See "Compass Calibration" later in
this section for more information.
The compass may also need cali-
bration if it displays an incorrect
reading.
If an incorrect reading is displayed,
first check that the compass is set
to the correct variance zone. If it is,
the compass needs calibration.
See "Compass Variance" later in
this section for more information.
Compass Calibration
The compass is self-calibrating,
but if C or CAL appears, or if the
compass is acting erratically, you
can manually calibrate it.
Before calibrating the compass,
drive to an open area that is
magnetically clean or free of large
metallic objects such as high
tension power lines or large steel
buildings. Verify there are no
magnetised roof antennas, or any
other magnetised objects inside or
outside the vehicle near the mirror.
• In order to calibrate the com-
pass, C or CAL must appear in
the display. If it does not, press
the button until C or CAL
does appear (about nine
seconds).
• When it is safe to do so without
disturbing other drivers, slowly
drive your vehicle in a 360°
circle at a speed of 8 km/h
(5 mph) or less, until the dis-
play reads a direction.