IACSR - 4/26/2007 07:50  I can tell you that SF1 has no challenges keeping a 4930 sprayer on track as fast as 3rd gear will go. If you've ever been in the seat with a good applicator, you know that's moving more than 8 to 10 MPH. RTK is nice and it has it's place. In my honest opinion though, and this is just my opinion, if you don't have integrated autotrac (i.e. if you have an ATU or EZ-Steer) you're wasting your money on RTK. Also, until we work out implement guidance completely, if you aren't in rather level ground, it's not worth it for now.