I don’t have a GPS for a Mychron for sale, but maybe something else to consider — on my track bike I use the Qstarz BT1000ex GPS unit, comes with Qracing software that does lap analysis and tracking, 10hz/10x per second resolution, I’ve enjoyed the software and its helped me drop many seconds on my lap times much much faster that I would have without it. Its about $170 or so iirc, and not real time in that you need to download the unit to a laptop or PC when you want to view the data and get some feedback. fwiw, good luck with your search either way.