But where we live True North and Magnetic North are not the same. According to the Australian Government web site they are about 11 degrees different.
Calculated: Latitude -37.8179o, Longitude +145.3650o, Elevation 870.00 km, Epoch 2013.2932 (Actual – 37.817884S, 145.365076E)
Magnetic Field Components
D = 10.931 deg
dD = -0.003 deg/yr
My question the was, foes the iPhone compass measure true north or magnetic north? Well it turns out the iPhone compass does both. You just tell it which one to say. I made sure it was set to true north and whalla! The angle of the house was measured. I was surprised to find it faces so much to the east.
The house actually points about 27 degrees east of north.