[quote=Gammel;1093208]i did spread up my submarine divisions to single submarines and ordered each single sub to patrol on itīs own.
march separeted - strike united!quote]
That quickly becomes a micormanagement nightmare, so I suggest you use the Area Patrol order instead. With this, you pick the center of the patrol area and its radius in map hexes, and that's it. No more worries. From then on, the TF will automatically maintain about 1/3 to 1/2 of its ships on station wandering randomly around the patrol area, another 1/4 to 1/3 in transit to or from the patrol area, and the rest in port refitting and repairing.
I sometimes split a couple of zeps off (subs are too slow for this) to drive around independently exactly where I want them, but all my patrol boats, obsolete DDs, subs, and zeps are on area patrol.