Afaik, millitary GPS'es are more accurate than those for civil usage as well.
They used to be, many years ago the military had their own frequency with an encrypted higer precision signal whereas the civilian band had a deliberate error in the signal, giving an accuracy of tens of meters at best. They stopped that a long time ago, and nowadays it depends on what satellites you have in view (newer sats send out on different bands that allow higher precission), and what kind of hardware you have, but civilian dual frequency receivers are just as accurate as the military units, with only some (legal) restrictions on speed and height.
Either way, no GPS receiver ever, military or civilian, was anything other than a passive receiver, and thus impossible to "track".
