I got this idea from Lythander but really didnt like the design ( sorry Lythander! ) so i have created this one.

It has marks at off compass axles ( NW for example )

The main axles has the + - or 0 marking on sides of it, while off axle also have that, but grey.

i also have made lettering and marked much more visiable than verent's one. also remade the frame so pointer is sharper.

enjoy! i certainly enjoyed making it