I would be down for some GPS mounted in my arm.:mrgreen:
This could eventually lead to some pretty crazy stuff...like cell phones mounted in the palm of your hand.
The down side is it wouldn't b a tattoo as you think of them today. It's the size of a grain of rice for 1!:shock: Tattoo pigment/ink is WAYYYYYYY smaller than that! You would need surgery to have them "implanted" in you, not tattooed!