[Puster Bill]

joegrundman is right, there is an in-game version of the wheel above (and the front side of it). There is also a stand-alone flash version that I use when it isn't convenient for me to use the physical version.

I do have to say, though, that I like using the physical version, and use it in preference to the virtual versions whenever possible. I also have a few slide rules that I've used. I still use a linear slide rule to do my AOB calculations if i'm using the "length/mast height" method. For some reason, linear rules are more intuitive for me when it comes to AOB.