Simrad has added the GO12 XSE (starting at $2,149) and GO7 XSR (starting at $649) units to its GO stand-alone chart-plotter series. These multitouch displays also come with built-in sonar, and they network with 3G, 4G and Halo radar systems, StructureScan HD and chirp sonar modules, autopilots, and SonicHub 2 systems. They come with internal GPS receivers and connect to NMEA 2000 sensors. Numerous options for cartography are available, including C-Map and Navionics products. GO7, GO9 and GO12 stand-alones now feature an unlockable add-on called VelocityTrack for Halo radar systems. The feature allows boaters to determine whether a target is closing, diverging or stationary.