By default, the True East mode is enabled (when the switch is ON). This mode uses your current locations and your compass heading to calculate the exact geographic direction of the Kotel.
On the other hand, the Absolute East mode (when the switch is OFF), uses your compass to show you the direction of the East relative to your heading.
Since this compass needs the built in GPS and compass, it only works on the iPhone 3GS. The digital compass should only be used for basic orientation, please do not use for any major project since magnetic fields can harm the accuracy of the compass.
No, not this one. And read this.
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