My initial impressions of the dragy
Link to item: https://amzn.to/2HclBRS

Dragy uses high speed GPS satellites to accurately measure your vehicles performance within 1/10th 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.
Link to item: https://amzn.to/2HclBRS