Radio Shack 63-1120 - Manual (Page 4)

4
3. Firmly press
the bracket
with the
compass
against the
vehicle’s
windshield.
4. Adjust the
angle of the
bracket so
that the face
of the compass points to the back of the vehicle. Then adjust
the bracket to an angle no more than 20
°
above or below the
horizontal plane.
5. Tighten the bracket’s screw to hold it at the desired angle.
Caution: If you use a reflective sun shade, do not leave the
compass between the sun shade and the windshield. The
extreme heat might damage the compass.
Note: Your compass will not calibrate correctly and will not be
accurate unless it is mounted so the display faces the back of your
vehicle and is titled no more than 20
°
above or below the
horizontal plane. The selected angle must stay fixed after
calibration for the compass to remain accurate.
CALIBRATING THE COMPASS
Calibration enables the compass to separate the earth’s magnetic
field from the magnetic fields generated by external influences
(such as your vehicle) so it can provide accurate heading
information.