sbright33:
I have a satellite modem that could send the location from a bigger bottle. Not so expensive!
Wouldn't need to be as long as the led faces up and always the same color. There are satellites with spectrometers and after enough lights show up the measure would be analog.
Really it seems that a lot of trash accumulates in these places, if they knew how many bottles got tossed in then some data on roughly how many got into the mess might be useful.