Pro 700, NAVII, and a 372 receiver. You can easily see it by looking down the edge of where you're working. Like I said, a full mile field takes almost 15 minutes so you are pushing the limits of pass to pass accuracy and you can see the line has an arc to it. You can also see it in how much the chisel plow is overlapping. Set to overlap a foot and was more likely to be overlapping 2'+ or skipping a foot or more by the end of a pass. Never had that show up with SF1.

Lances test showed that SF1 is more like Omnistar accuracy wise IIRC. That was also before you got GNSS for free with it.