In this particular example, this constellation requires six polar-orbiting satellites. The earth is rotating; the satellites are going over the North Pole and the South Pole, and the earth is spinning underneath. So in a period of time, this one satellite will actually look at every piece of the earth from the North Pole to the South Pole and everything in between. The problem is that it does it fairly infrequently, and when you're tracking ships, people want to see them on a more regular basis. So you need to have more satellites in orbit.
In our case, we've calculated that with six satellites we can provide an update, the worst case, for every one and a half hours. Since a ship is typically travelling at seven knots or ten knots, if you pick it up every one and a half hours, it's only travelled eight or ten miles, and that's more than enough to provide the sort of accuracy you need. Interestingly enough, the further north you go, because the area is smaller, you actually pick the ships up more frequently and provide more persistent coverage.
We've spoken to 45 different countries around the world--the Argentinian navy, the Indonesian coast guard, and so on--and those people are very interested in gathering this data. But primarily, the focus is looking after Canadian national needs.