It will do it via a compatible smartphone, so just remember it'll only work for as long as the phone's battery lasts.
Had a nice long reply about this, but my internet dropped out (thanks Commander you fuckin muppets) and I lost it, so here goes round 2!
The 510 and 810 are good at sending data so you can be tracked, as long as you have a data connection and enough battery life left. So you really have to be with the major telco whose coverage is fairly extensive if you are going to rely on this technology. Then there is the battery life of your phone. I have a samsung and it wouldn't last 2 hrs of constant drain.
I use the Mapmyride app on my phone and if I am riding by myself I set it to update Facebook every few km or so. If I happen to need help, in theory, my wife can look at my position via the link and see where my last location was. Far from perfect but it is OK as I only ride well known trails. Going to the blue mountains over the xmas break and will be on unknown (to me) trails so I will have to think of a better system, or find someone else who wants to escape their in-laws as much as I do to go riding with me.
I've also been meaning to buy a portable emergency phone recharger to stick in my backpack. If something bad happens and I need help it's not really a matter of just a 30sec phone call. They like you to stay on the line and give directions, condition updates etc.