If we take the traditional scenario of the bells and phone call, the helm orders and such, we could have a sighting about 1 min., 15 secs. before strike (approx). The berg is sliding past Titanic as she glides on, and EJ comes out-- with ALL the warnings and other hooplah---and asks Murdoch, "What was that?" DUH??!!! Weren't you EXPECTING ice? Just how "on the bridge" were you? The berg is now far enough away that Boxhall, looking out the starboard bridge wing w/ Smith, is not 100% certain he sees it. Was Smith THAT dense? "What was that?" If I were the captain in this scenario, I would have come out to the MAIN bridge as soon as I heard the 3 bells. Surely if I were that close I could have heard Murdoch's helm orders. Hearing the bells and the helm orders, PLUS the grinding would have had me out soon enough to see the berg before it passed the bridge wing, unless I were so deep into the rooms--or sleep---that I couldn't. "What was that?" Somehow this fine mariner's faculties were dulled.