This package is a ROS release of a driver for Swift Navigation's Piksi RTK GPS receiver module. A pair of Piksi modules connected by a wireless link provides the location of each receiver relative to the other with accuracy as good as a couple of centimetres, and in addition, each Piksi module provides its location with typical GPS accuracy (about 3 meters). Typically one module is a stationary base station, which may be located at a surveyed point, while the other is mounted on a rover and provides ROS navigation software with a highly accurate position relative to the base station.