I don't think it is that simple even for commercial products. Probably so for a non-steer-ready tractor but many tractors these days already have a screen that can handle auto-steer tasks. If they come with a pre-installed steer valve, all you need is the GNSS receiver on the roof. A Trimble or Topcon setup would need an additional screen and still may not work directly with the OEM steer valve.Cheapest and best in my opinion is always a Proper gps screen like Trimble or Topcon than built into tractors systems.
If it is not gps ready, a steering wheel motor like Trimble ez pilot would probably work out the cheapest and be fine for drilling.
Are there many used ones about?I assume you are looking for 15 cm or under in terms of accuracy. The Nav-900 antenna with a GFX-350 or GFX-750 would be a good start. You can upgrade accuracy with rangepoint RTX or Centerpoint RTX for 15 cm or less and 2.5 cm or less. Steering wise, the EZ-Pilot would be what id recommend but many people use EZ-Steer for this type of operation.
Steering Comparison Chart
Guidance Display Comparison Chart
Do you mean "a separate nav controller box", it is integrated to the receiver box now. Trimble has changed to the same approach as e.g. Topcon for 15+ years.Was told that later model Auto Steer ready New Holland tractors didn't need a nav controller? Is that right? And if so how can you tell if you need one or not.
Tractor Mother Regulations.Tmr tractor????? It's a June 18 tractor. Got Gfx 350 in another tractor that I could use.