This came up when GPS receivers got small enough to easily hide. They
were illegal for use in contests for a while, then they became legal
and now they're mandatory

Then again, what's the difference between logging into DUATS with a web
enabled phone and calling flight service on the radio - or the phone?
It's legal right now to get weather info from a "public" source while
flying, as long as it's over the radio.

-Tom