06-28-2009 08:16:59 PM
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06-28-2009 08:38:04 PM
The compass calibration instruction are in the iPhone users manual on page 172. There is no calibration for a GPS device. The reading where they are off the mark might not be GPS. Before there is a GPS fix or when there is a loss of/poor GPS signal you might still be getting a location from cellular triangulation and possibly WiFi. Stand outside in the open and open the Maps applications and check your location.
Getting Compass Readings
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.
Your current (approximate) location is indicated by a blue marker. If your location can’t
be determined precisely, a blue circle also appears around the marker. The size of the
circle depends on how precisely your location can be determined—the smaller the
circle, the greater the precision.
As you move around, iPhone updates your location, adjusting the map so that the
location indicator remains in the center of the screen. If you tap again or drag the
map, iPhone continues to update your location but stops centering it, so the location
information may move off the screen.
iPhone uses Location Services to determine your location. Location Services uses
available information from cellular network data, local Wi-Fi networks (if you have Wi-Fi
turned on), and GPS ( iPhone 3G or later; GPS not available in all locations). This feature
isn’t available in all areas.
If Location Services is turned off, you’ll be prompted to turn it on. You can’t find and
track your current location if Location Services is turned off. See “Location Services” on