Right, or any vessel that goes into some area of the Northwest Passage, if the weather changes, the ice changes, then they need an icebreaker.
About 10% of the Arctic is charted to modern standards. It needs a significant amount of work, but, as I said, we don't think it is reasonable or feasible to think that we can chart it to the same standards as the south throughout, which is why we are pursuing a corridors approach, where we will have safe, predictable, transitable passages that are charted and the information is available to mariners so that they can safely transit, weather notwithstanding.
In terms of aids to navigation, they're mostly in Pangnirtung and Mackenzie River. The aids system that you see throughout southern Canada and the Great Lakes, as an example, doesn't exist in the Arctic.