I hardly ever radio home, i go out do whats ordered of me and head back home. Now if its a photo recon or insertion mission i'll take some time to stalk the shipping lanes looking for targets, but using the radio gives away my position so i avoid that as much as possible.
As to reality, The Captain of the USS Shark was chastised by command for reporting too many contacts with too little info, shortly after that the Shark was never heard from again. Its possible that the reports he sent gave the boats location away and it was located and sunk due to this. We will probably never know because the final resting place of the USS Shark is still unknown.
I have never had a problem with my career by not using the Radio or even not completing a mission. If they send me on a suicide mission i never leave port, i just dock again and get a new mission. I blame a faulty hatch or machinery and take the next mission offered and i have made it to late 1944 without any issues (After that i was sunk and had to start over LOL)
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