What's your declination? If your compass is equipped to adjust for magnetic declination (and it should be) the following link is very useful in finding the declination in your AO.

http://magnetic-declination.com/

As I have only used Brunton pocket transits for the last 40 years, I have no idea if other compasses are equipped to adjust the declination as Bruntons are, but I found the declination for my AO this morning and adjusted my compasses accordingly. Now, my compass needle, which points to magnetic north, also accurately tells me true north.