Most of Alabama lies along the declination zero line. So, there is no declination adjustment needed in Alabama.
No
Assuming the subject is magnetic declination the difference between the north pole and the true north pole this difference, is the magnetic declination, there is not information on what purpose it serves.
Magnetic Declination
+15° 45'
12E
magnetic variation
18.3 EAST
23
3.6 W
3 degrees
16 degrees west