I've gone into the GlobalTrack Admin panel and done a "position request" with no joy, so I think they've forgotten to plug the satellite tracking unit in because there has been no update since this morning.
It joins the recorded positions together. I didn't think they were leaving today so I didn't type the position in for a few hours hence the big straight line.
It's something else I added to Google Earth from someone else's post. Moose 1 seems to know all about it. perhaps he'll point you in the right direction.