And if you have an Amateur Radio License there is the APRS tracking
option.

Here is a flight in Colorado (where you might think the coverage may
not be good) for this summer:

http://aprs.fi/?call=N8RNW-6&dt=1311...timerange=3600

A device like this: http://www.byonics.com/mt-rtg is easy to stick
in the glider

More information available at: http://www.aprs.org

And if you do not have an Amateur Radio License, get one. It is not
that hard. There are networks of linked repeaters that will give you
radio contact to your crew over distances that your aircraft radio
wont.