I was working with a coop to Vr some fert with a Zynx X=20 they had in there spreader. Coundn't get it to work. Called everyone I could think of, ended up being a simple fix. A Zynx requires NEMA GPS strings to come in on two com ports. Found the DB9 splitter and installed it and it worked. The give away that this is going on is that if you are in prescription area. You should see a boom where you currently are in the prescription. If you do not see where you are at in the prescription on the VRC tab. Make sure you have GPS going to VRC.

Mike