Compass readings increase clockwise from 0 to 360, but Cartesian
coordinate systems increase counter-clockwise. This method returns
the Cartesian compass reading. Also, the resetCartesianZero() method
can be used to designate any direction as zero, rather than relying
on North as being zero.
Cartesian direction. Between 0 and 360, excluding 360. Values increase counter-clockwise.
Changes the current direction the compass is facing into the zero