11. Compass
(continued)
Compass Button
For the satellite-based compass (GPS mode) to provide an accurate heading, you should
be outdoors with a clear view of the sky and moving at least a few mph or km/h. The
magnetometer in the iPhone is susceptible to magnetic interference from electronics
and ferrous metals. If an accurate direction cannot be achieved due to interference, you
will be instructed to move away from the interference and re-calibrate the
magnetometer by moving your iPhone in a figure 8 pattern (turn off this warning in
Setup>General).
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Magnetic Mode:
Uses
the built-in digital
compass. The icon is a
compass rose (8-pointed
star).
GPS Mode:
Heading is
determined using orderly
changes in position
Auto Mode:
Uses the
magnetometer at speeds
below 5 mph and GPS
positional changes above
5 mph. The icon is a
sextant.
Compass Modes
(touch to toggle):
Weak GPS signal:
Red
compass button indicates
weak or no GPS signal
Inaccurate heading:
Heading accuracy is
<85%. Sustain a speed
of more than a few mph
(or km/h) for an
accurate heading.
