Nick_Pyner:
A GPS bottle, what a great idea.
It makes it far easier to clean up the mess you made.
I kinda agree with this. It sounds like a wonderfully romantic idea in theory, but then you have to consider the fact that you just threw 500-1000 bottles into the ocean, along with all the associated e-waste, and will likely not have the resources to reclaim most (or any) of them. In these parts, we call that "littering".