I usually start my careers in the mid 40's to 41. Havent started in 39 in a while and not since I started using GWX 2.*
I noticed that the Brits dont do alot during this time. I have sunk several freighters in the channel, very close to the coast and in the Irish Sea. Any other time I would wait just a little bit to spot an aircraft followed by the hydrophone picking up a closing contact. BUt in good ol 39 not a single aircraft or DD has come to see whats sinking their merchant traffic.
Hehe I almost miss being DC'ed