Yes its well unrealistic. From what ive experianced there can be a decleration of honour, ie no comms unless at periscope depth and then only with another sub that is.
Idealy we should have a 'hard core' option that only allows people to do so when applicable, then the fog of war would be complete.
Still, given the time it can take to prosicute a contact and the fact that one of the best ways to pass the time whilst doing so is chewing the fat its a godsend.
Would be nice to have the option though
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