The ground-based LORAN network has been aiding navigation since WWII. Now, it is being shut down to save money, based on the thinking that the GPS system has made it obsolete. I had direct experience with the Pacific LORAN array and its coordinate system during the LIFEboat Flotillas. Most of the LORAN stations will go offline on February 8th, with the rest shutting down in the fall.
It is probably fair enough to say that LORAN is antiquated and redundant, though GPS is not without problems. It may eventually get a backup, if the EU finishes building their Galileo navigation satellite system by 2013, as planned.
Both LORAN and GPS function on the same basic principle: that if you know where certain radio transmitters are, and how far you are from each, you can sort out where you are located. GPS has the virtue of being global and increasingly ubiquitous, as more and more devices become capable of locating themselves using the system.