> 1. Simple, small, fast, (helmet-mounted?) vario - no integrated GPS!
> 2. For free-fall parachuting - you just passed 3,000' (2,000', whatever)
> going too fast - BEEP! pull now! 3. I have a friend into model rockets -
> how high do they get?
>
> Thoughts on any of the above would be very welcome.

I guess you won't get many complaints if it doesn't work ;)