Audio-guided GPS coming to MP3 players?

Technology being developed in the United Kingdom could soon allow GPS navigation without expensive software and displays, according to BBC News. University researchers in Swansea and Glasgow are instead collaborating on an audible guidance system, which could be used in MP3 players and allow music to continue at the same time. After a fixed destination was set, the new system would adjust volume in each ear as direction changes come up. Players could be further programmed to "nudge" a listener towards points of interest, by either adjusting stereo balance, or vibrating the player itself. At the moment, however, this is purely hypothetical -- there is no estimated timeframe for when development will be finished.