Other courts though have held decidedly less benign views on the use of GPS. Courts in Washington and Oregon have in past cases held that law enforcement authorities require warrants to conduct GPS tracking. In coming to these decisions the judges have argued that the do not just augment existing abilities, but allows access to a large amount of additional information on an individual, Verdi said.

Chief Judge Lippman wrote that GPS devices are "vastly different and exponentially more sophisticated" devices than pagers or other tracking devices. "Constant, relentless tracking of anything is now not merely possible but entirely practicable."

He said that data retrieved from such devices can open a window into almost every aspect of an individual's life. "What the technology yields and records with breathtaking quality and quantity, is a highly detailed profile, not simply of where we go, but by easy inference, of our associations -- political, religious, amicable and amorous."