Mathematical shooting solution
 

http://img182.imageshack.us/img182/1...peed4ts.th.jpg

Triangle ABC is solved after you obtain two ranges and bearings using the Law of Sines, then the ranges are added to the legs of the triangle allowing you to solve how far the target has travelled in 3:15 using the Law of Cosines.

Look at this page:
http://www.dreadnoughtproject.org/

Especially here:

http://www.dreadnoughtproject.org/sim/

Look at the links http://dreadnoughtproject.org/sim/me...ctor2006_1.mov

and
http://dreadnoughtproject.org/sim/me...ctor2006_2.mov

This is about surface attacks and using WWI the but the principles are the same.

Sweet Lawd, Joea...

Mein Gott..!!