No, NMEA updates at once per second should be fine. I tried this out again and I'm pretty certain flite is just too slow. One of the reasons may be because it was apparently statically linked with another version of libc (thus making it 5 MB). Try running with the music paused- for me at least the voice does work but even then GPSApp is slow updating and gets behind in the queue of what it should say next. I'm going to try to recompile flite with the empeg's version of libc and see what happens next.