Hey Craig,Thanks for the offer. Since I'm already deep in DirectSound I'll probably stick with it. If I used the DirectX.AudioVideoPlayback library I used for TB and adjusted the panning and volume changes of sounds myself then I'd get the mp3 support but I just used DirectSounds built in 3D support.
I am interested to hear more about the turn by turn navigation.Is this like something that leads people to a beacon by giving them turn by turn instructions? For instance guiding them around buildings and through doorways to reach a beacon rather than having the beacon just play in the direction of the destination regardless of obstacles in the way? I'm also interested in a high level explanation of the navigation techniques you used and what the PGCert project is.
I look forward to trying your map. Ian Reed