Magnetometer & Compass

Category	Price	Seller	Device
Utilities	$0.99	SREERAMULA LAKSHMI DEVI	iPhone, iPad, iPod

RED arrow
showing CLHeading.magneticHeading - the iOS 'compass' measure
GREEN arrow and progress bars
CLHeading.[x|y|z]
BLUE arrow and progress bars
CMDevice.calibratedMagneticField.field
YELLOW arrow and progress bars
CMMagnetometer.[x|y|z] raw magentometer data
MAGENTA progress bars
show difference between green and blue measures.