Some of you may have looked at a book I wrote a few years ago. My information is a little bit out of date, but I think that the NORAD capabilities in the north are really quite limited. We have the north warning system, which is along the 70th parallel, and when you go north you're looking at satellite coverage. The most important satellite coverage—again, my information might be dated—is Canada's RADARSAT and Polar Epsilon and the RADARSAT Constellation, which was promised and may or may not be going forward. It is absolutely critical to have those three or five satellites, low-based, looking down at the Arctic at all times.
Canada is further ahead in that area than the United States. The United States had a whole program in place and then the funding was cut, etc., and it was actually looking at one time within the last couple of years at Canada's RADARSAT Constellation. We need to move forward on that, and that is the highest level of surveillance. Then the lower level is unmanned aerial vehicles, which I think are critical. They're the answer to providing real-time continuous surveillance over a large barren area.
Then further down, of course, we have the Aurora long-range patrol aircraft, which are in disrepair and old and won't be replaced, as we found out maybe about three weeks ago.
Underwater, I believe we have put in place acoustic systems. It's a delicate thing because oftentimes the submarines we're looking for are American Trident submarines, but our defence R and D has experimented with underwater acoustic systems for tracking submarines.