When you use a magnetic compass, the needle points to the Magnetic North. This is a slightly different direction than the True Geographic North, which is along the Xaxis of our coordinate system. The angle difference between True North and Magnetic North is called magnetic Declination angle D. It is positive if the compass needle points to the east of True North, and negative if it points to the west of True North. This is a very important number to keep track of for navigation.
So what is the magnetic declination in my backyard?
According NOAA data (see this link) the declination is about 1,999°
The magnetic Inclination angle, I, also called the Magnetic Dip angle, is a measure of how steeply a magnetic field line passes into the surface of Earth. If you were to hold a compass perfectly horizontal, it would 'point North' but its tip would also dip vertically to the ground. This feature was first discovered in 1581 by the English mariner and compass builder, Robert Norman.
So what is the magnetic inclination in my backyard?
According NOAA data (see this link) the inclination is about 66,35°
What about Bx, By, Bz and the total magnetic intensity B?
According NOAA data (see this link) Bx=19644nT By=685nT Bz= 44898nT
The total magnetic Intensity B= 49012nT
According my iPhone B=47580nT (using App Physics Toolbox Sensor Suite)
