User Guide
Compass
20
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: The accuracy of the digital compass may be negatively aected by
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.
The compass needs to be calibrated the rst time you use it, and may need to be
calibrated occasionally after that. iPhone alerts you whenever calibration is needed.
Note: If location services is turned o when you open Compass, you may be asked to
turn it on. You can use Compass without turning on location services. See “Location
Services” on page 191.
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