Use this cable if you need to set up your GPS Pathfinder Pro XR or Pro XRS receiver as a temporary reference station outputting RTCM corrections. When using this cable, once you have set up the RTCM output using the TerraSync software, you can disconnect the field computer and the Pro XR or Pro XRS receiver will continue to operate and output RTCM corrections. This cable can also be used with a Bluetooth adapter to keep the GPS receiver powered on.