get Combined Direction Segments
This represent the original iOS COMBINED direction type which they described like this:
Ahead, Right, Behind, and Left all get a 150 degree window centered in their respective directions (e.g. right is 15 degrees to 165 degrees). In the areas where these windows overlap, the relative directions get combined. For example, 0 degrees is "ahead", while 20 degrees is "ahead to the right."
Return
an array of Segments describing the angles
Parameters
heading
Direction the device is pointing in degrees