GPS jammers are easily available on the Internet. Nevertheless, GPS jammers are frequently used by truck drivers and other people with a company car that don’t want their employer tracking their every movement. [phasenoise]’s teardown of the GPS jammer he found on unmentionable websites shows the device is incredibly simple. It should be said again that you should not buy or use a GPS jammer. If you need to build one, though, they’re pretty easy to design as [phasenoise]’s teardown demonstrates.