Dave, I looked on Vectronics website and it looks like you are referring to the PLRF 25c. This one has the ability to communicate with ballistic programs on remote devices such as the Kestrel and Trimble Nomad. It has an electronic compass that when used with a GPS enabled device allows the user to identify the exact GPS location of the ranged object. All kinds of sinister acts can be brought to bear on the aforementioned location if the user has an F-16 hanging around or is in communication with Artey. It appears it will be much higher in cost than the Terripin.