I meant the original Ubisoft developers did not complete the game. There a quite a lot of unfinished features that would have made for an even more immersive game had they been completed.
The radio messages you receive that are not "Contact Reports" are simply there for the immersion factor. You don't have to obey or follow any directions given in these messages if you don't want to.
The grid assignments are a bit random at times. If you get a bigger boat you will be assinged longer range patrols. As you are using GWX stay away from the English Channel. It is heavily patrolled and mined and is not a safe place to play.