Buick 1997 Riviera Owner's Manual Page 114

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Compass
Variance
Variance is the difference between magnetic north and
geographic north.
In
some areas, the difference between
the two can be great enough to cause false compass
readings.
If
this happens, follow these instructions to set
the variance
for
your particular location:
1.
2.
3.
Find your location on the
-me
map. Note your
zone number.
Hold in the
CAL
switch (on the bottom of the mirror
housing) for five seconds until the current zone entry
number appears on the display.
To
hold in the
CAL
switch, insert a paper clip into the small hole
on
the
bottom
of
the mirror housing.
Repeatedly press the
CAL
switch until the number
for the new zone entry is displayed.
\
Once the desired zone number is displayed, stop
pressing the
CAL
switch and the display will show
compass direction within a few seconds.
2-53
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