Nikon CoolPix S9700 Reference Manual page 214

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Notes About Using the Electronic Compass
The electronic compass is not displayed when the camera lens is facing upwards.
Do not use the electronic compass in this camera for mountain climbing and other
specialized applications. The displayed information is intended as a general guide
only.
Direction may not be measured correctly near the following objects:
magnets, metals, electrical motors, electrical home appliances or electrical power
cables.
Direction may not be measured correctly in the following places:
in automobiles, trains, ships, airplanes, inside buildings or in underground malls
Direction may not be measured correctly if the location data is not obtained.
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