I did a similar thing for my club but we only use FAI sanctioned
loggers. Why? Because a standard GPS cannot be use for badges (and
records), which is a critical. If you don't fulfill this need, I
think that your members will be very upset when you have to tell them
that their great flight can't be used for anything but the OLC.

One other point is the "tossing" part. Any GPS needs a clear view of
the sky. While fiberglass doesn't stop the signal, aluminum (L-23,
etc) will. Therefore mounting becomes quite important.

See my web site http://www.geocities.com/jhderosa/av...recorders.html
for more details and pictures.

Good luck, John DeRosa