It's just gravity. It will stay up there in that orbit, but the satellite, as you can imagine.... Picture an ExpressVu or a Shaw Direct dish; it's this little dish on the ground. The satellite really does have to maintain a very specific spot in the sky.
There are thrusters on the satellite. If you come up to our headquarters facility on Blair Road.... I invite all the members of the committee, if you ever have an interest, and we're only ten minutes from here--come on out. We literally have rocket scientists who work at Telesat, highly specialized engineers trained in orbital mechanics. They maintain the satellite 36,000 kilometres in the sky in a very tight box.