That's really interesting!
$1, it used stereo audio to create a '3D soundscape' that would give cues in the direction of items of interest, which is cool but I think it still a little too unfriendly to use daily.
I'm think my aim is to develop something that's a little less 'in your face'; that can do custom directions but also consistently relay a range of local information without 'shouting' it through your ears every five seconds...
Many thanks