What they do in the real world?

[OKO]

Originally Posted by ReubenJames

I designed my own missions.

I placed my boat within the battlegroup. I can't receive any broadband nor narrow band meaningful signal.

Question: In the real world, do submarines stay very far away from its battlegroup, like at ;east 5 miles away.

As said Bill, 5 miles is very CLOSE to the battle group.
They use to be much farther than that.

You can try this mission =>
http://okof4.free.fr/missions/DW/MP4_Steel_storm_v1.mu

it's a fight beetween 2 task forces, with SSN opening the way for each of them.
Edit the mission to see how I put the SSN relative to the battlegroup.
As SSN have random positions, you could see the closest position with the TF is 20 miles in front of her, and the farthest is 40 miles on left or right side.

The first detection will be made on active intercept and not on sonar.
You should use this to improve you path for interception, until you get them on sonar.