Dragy Universal GPS Based Performance MeterDragy uses high speed GPS satellites to accurately measure your vehicle's performance within 1 100th of a second, producing identical results to the much more expensive and cumbersome VBOX system, in a less expensive and easier to use package. The Dragy software automatically charts slope on all timeslips which you can then post to forums or social media, share with friends, or even upload to the Dragy leader board. The Dragy box is extremely compact