A. Yes, 3D Guidance trackers are drop-in replacements for many Ascension magnetic trackers that you once used. trakSTAR is fully compatible with Ascension magnetic trackers that use RS-232 and USB interfaces. trakSTAR supports Flock of Birds, miniBIRD and all other Ascension magnetic tracker using the RS-232 Interface, running winBIRD, CBIRD, SBIRD and SOCKET programs, and employing Windows drivers. 3D Guidance (older model), microBIRD, and pciBIRD users can substitute new USB and DLL (drivers) and continue to use old applications. Note, however, 3D Guidance trackers do not presently support the extended range transmitter that is available with legacy products. If you need extended range tracking, you can still obtain it by buying a Flock or MotionStar tracker.