I’ve added a link up on the menu for this feature.
If you’re using a mobile device that is GPS aware, this feature will show the radio stations that are “near” your current location.
Since you’re carrying a cell phone that presumably can stream, I’m not sure of the actual value of being able to ask what the stations are that are nearby – but there you go.
Of course, by authorizing your phone to tell me your location, you’re (in theory) telling me your location. It’s up to you whether that bothers you.