Problem Statement

Finding the angle between two bearings is often confusing.[1]

Find the angle which is the result of the subtraction b2 - b1, where b1 and b2 are the bearings. Input bearings are expressed in the range   -180   to   +180   degrees. The  result  is also expressed in the range   -180   to   +180   degrees.

Compute the angle for the following pairs:

Allow the input bearings to be any (finite) value.

Let's start with the solution:

012pv1   2      3        4              5         6           7    8
    >&:v   >859**%:459**1-`#v_     >12g!:12p#v_\-:459**1-`#v_     >.>
       >0`#^_8v             >859**-^                       >859**-^
       ^:+**95<                              >                      ^