Firing torpedoes submerged and in bad weather

[_Seth_]

I was tired of beeing unable to attack ships in the fog & when i was submerged (and couldnt use the scope. So i was depending on the hydrophone and the map (with the ruler for distance measurements + the 3.15 min. rule for target speed.) So i wrote a little tool to help me with this. The only clue is that i dont know if its correct, since i wont be seeing my own computer again before wednesday (This is my Sisters computer, and she doesnt even have SHIII installed!! She must be thrown out of the family..!) Could anybody look into this, and see if i have done something wrong here? Please correct me if i have, and you are all free to modify and use these files as you like. PS: you need excel to open the .xls file, the .bmp is a paint picture

Attack_calculator.xls:
http://files.filefront.com//;6030778;;/
intercept_plan.bmp:
http://files.filefront.com//;6030779;;/

Please give feedback, good or bad; i appreciate it!

And its 100 % virus free, mates!