What is the predictable endpoint of the trend toward ever cheaper, ever smaller, and ever more sensitive GPS receivers? It’s the GPS dot: a miniature GPS tracking device that we’ll buy in bulk and stick on almost everything of value that we own. But the dot has a dark side: the capability it enables for secret and potentially malicious tracking of others. The need to protect ourselves from invasive tracking will motivate use of subversive tools such as GPS jammers and spoofers. A rise in the use of these illicit tools has the potential to wreak havoc on the «good» GPS receivers — those built into our critical systems and infrastructure. The result: A looming showdown between privacy and GPS integrity.