How is it that tricking has an issue with gps speed times, where in slalom, your going much faster and it works? That I dont understand. I am on a 2500 foot tournament lake... actually 2 lakes. PP told me SG updated 5x per second. That should be good enough for everything. I understand the pull difference, I'll just have to deal with it. Im comming of an old RPM only (era 2003) system, ought to be worlds better than that. We'll see, system comes this morning. Hopefully I can get it installed in a few hours.