.
Hmmm... via pg 24,
Flight Safety Australia, March/April 2012...
"...Australia is at a watershed in its ATM, with many legacy ground-based navaids, such as non-directional beacons (NDB) and VHF omni-range (VOR) equipment, approaching the end of their useful life. The intention is to complete the transition to satellite navigation, which commenced in 1995, by early 2016, while retaining selected navaids to
back up and mitigate any problems with GPS..."
Heh, to "back up andmitigate
any problems with GPS"... Why the backup ?, whatever could go wrong with the all singing all dancing GPS..?
.....and whats with the "problems"..... not just
a problem, we got
problems with GPS..
.