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In This Tutorial We Will Show You How To Read Compass Readings on your iPhone.
The built-in compass (iPhone 3G S only) 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 digital compass headings may be negatively affected 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 first time you use it, and may need to be calibrated occasionally after that. iPhone alerts you whenever calibration is needed.
Calibrate iPhone:
Wave iPhone in a figure eight. You may also be asked to move away from a source of interference.
See which way you’re facing:
Hold iPhone level to the ground. The compass needle rotates to point north. Your current direction appears at the top of the screen. The coordinates of your current location are displayed at the bottom of the screen.
Switch between true north and magnetic north:
Tap 
and tap the setting you want.
Compass and Maps
The icon at the bottom of the Compass screen lets you find your current location in Maps. Maps also takes advantage of the built-in compass to show which way you’re facing.
See your current location in Maps:
Tap 
. Maps opens and indicates your current location with a blue marker.
Show which way you’re facing:
In Maps, tap again. (The icon changes to 
.) The angle shows the accuracy of the compass reading—the smaller the angle, the greater the accuracy.
