Syncwalk is a big idea that has a few meanings. I'll try to describe it in more detail as I go.
1) A Syncwalk is a walk with an extra twist: as you travel, you are accompanied by a seamless mix of songs that relate to where you are at that moment. (Who made the mix of songs? You did! Or your friend, or an artist you like, and so forth...)
2) A Syncwalk is a collection of songs with a geographical area defined for each song (or group of songs). They're transferrable and saveable, so you can share your compositions with everyone!
3) More fancily, Syncwalk is a framework for composing locative media experiences.
4) Syncwalk is also the name of the Android application for experiencing Syncwalks.
Well here's an image of a Syncwalk that I made. Each purple hexagon is a song, and the shaded region it lives in is the area within which you will hear that song.But a Syncwalk is an experience, it doesn't look like anything!