Repeatability (ctf) also when you spray - you never have to allign your line, you just start, section control with headland border, also when drilling headlands last, drilling headlands from inside and out and drilling from the "far side" of a field (every second year when following the plough from that side) and have it line up when you get to the "start".What advantage is rtk if just drilling cereals
I used SF1 for 6 years and was happy with the accuracy. I would never upgrade for accuracy, but the drift is an issue that i like to get rid of.