A collar to be worn on an object or a large or small animal has been designed incorporating (D)GPS technology. The operation of the device includes programming the three dimensional boundary into the memory of the device and simply installing the collar on the animal. As the animal approaches the preprogrammed...http://www.google.com/patents/US20060027185?utm_source=gb-gplus-sharePatent US20060027185 - Large area position/proximity correction device with alarms using (D)GPS technology
