The aerial assets dedicated by both Transport Canada and Fisheries and Oceans Canada's conservation, protection and science branches are targeting areas in which there are closures. The first step is a dynamic closure. Just to be clear, seasonal closures don't kick in right away. They occur only if there are repeated detections or aggregating of right whales in a given area.
What our comprehensive surveillance program has determined is that there are areas in the Gulf of St. Lawrence, for example, where they aggregate for extended periods of time, and they'll move and come back throughout the summer. The right whale period in the Gulf of St. Lawrence is largely between May and November, and in that period they are moving around and aggregating in various spots in the Gulf of St. Lawrence.
Our Transport Canada colleagues also base their measures on aggregations and how often the whales aggregate. The challenge is that aggregation changes every year, but we do see high numbers of aggregations in given spots in the Gulf of St. Lawrence. That's largely where the seasonal closures end up, not surprisingly, because there are repeated detections of right whales there by our assets, both acoustically and through aerial surveillance.