Because SH5 is unfinished and has a few problems I cannot guarantee that you can see the Icebergs, there is a weird 'camera-out-of-sectors' problem for example, also, your watch crew may not always alert you to their presense under TC. I'm sorry it's all very hit & miss, but if The Devs had been given enough time to finish SH5 then things'd be alot easier
I did put them in all the Total Germany and Artic Convoy missions, these are the only missions in the Campaign that occur during the Winter months and take you to areas where you're likely to encouter Icebergs. Happy hunting
