Question about GWX
 

I've started a new career with GWX 3 mod, i've received a curious radio message about going back into the bay and attacking a convoy and shoting at target ??? I've gone back to the bay, sunk 2 stationary ship and i never found the target... what is this ?

Training mission. I suggest you read the manual for GWX.

I've taken a look at the manual... :o wow that's a whole lot of info ! Thats a big book in itself. I havent found my answer yet, but i lose myself in all that data. I had no idea that this game can be so complex ! I'm impressed.

do you use some other mods?

That message is for the 7th Flotilla starting at Konigsberg, and it's silly. The 7th was never stationed there. If you want the 7th set your start date for September 1st when they're operating out of Kiel.