Fletcher,
Playing with icebergs is dangerous; they sometimes roll over on you.
There are posts about finding bergs in one free-roam environment—probably NY NA.
Hunt for the post, then hunt for the bergs.
If you are serious about wanting to see bergs, you can easily make your own mission with them.
There are some missions already made that include icebergs. “Titanic 2 Maiden Voyage†is one, but it takes at least 4-1/2 hours and is very difficult and, at times, boring.
Marty