User's Manual

Compass
20
APPLE CONFIDENTIAL — PRELIMINARY DRAFT
Getting Compass Readings
The built-in compass (iPhone 3GS or later) shows which direction you’re facing, along
with the geographical coordinates of your current location. You can choose magnetic
north, or have Compass adjust the declination to show true north.
Important: 
magnetic or other environmental interference, including interference caused by the
close proximity of the magnets contained in the iPhone earbuds. The digital compass
should only be used for basic navigation assistance and should not be solely relied on
to determine precise locations, proximity, distance, or direction.

calibrated occasionally after that. iPhone alerts you whenever calibration is needed.
Note: 
turn it on. You can use Compass without turning on location services. See “Location
Services” on page 200.
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