Hi Bwalter,
your app is really cool! Love the ui and the gps filter
I have a few suggestions to make it perfect:

- Altitude tracking (I know it's in the roadmap, but it's really important for activities like hiking or mountain bike )

- A "pause" button, or an automatic way to make it happen;

- A configurable auto-save function to protect the track from crashes or accidental closure of the app;