As far as I remember,a certain value for a certain patrol grid may be changed in My Documents/SHIII/Cfg/Data/Campaign/Kaleun's Name/Patrol_0.Just the same way one can change reknown values there.Same rule applies to U-Boat names.
But that may be too complicated and bothering,to edit the file just each time you go in for the next patrol.Guess,a managing tool like SHIII Commander might be quite helpful.
