I am the senior wildlife biologist with the German radio telemetry manufacturer Vectronic-Aerospace based in the US. My graduate work was on white-tailed deer using some of the fist available GPS collar technology. My specialty is assisting researchers with making informed decision on selecting the proper radio collar technology to achieve their research goals. Whether the choice is GPS, Iridium, Global Star, GSM, UHF, VHF, expandable collars, fawn collars, VITs, MITs, camera collars, virtual fence, proximity, mortality or accelerometer technology, I can help explain the benefits of each and how they might help answer your research question