I am curious, do you have the same anxieties about car drivers using maps applications to navigate?
Speaking of which... I'm still waiting for a bike helmet with a back-facing camera/HUD that is neither vaporware nor "smart" (read vendor-dependent and barely working), and doesn't suffer from basic usability mistakes. That would be infinitely more useful and probably easier to make than this.
Not anxiety by the way, just a healthy amount of distrust.