On Tuesday, July 14, 2015 at 12:59:34 PM UTC-4, Sean Fidler wrote:
Install XC Soar on an android phone. Free.

...you're done. 😀

- the end.

And, as I've stated before, not "everyone" has a Smartphone. Maybe it's a great thing for those that do, but at least 2 people in this thread don't have Smartphones.
;-)