Tried the rate and blockage sensor setup today and all the sensors worked.  I have my speed sensor set to iso ground speed.  Speed is registering but is mile and half faster then tractor.  It will not count distance or area for me.  Do I need to have some kind of ground speed sensor on drill to make this work?  Or should the iso ground speed do this?  My implement has the green arrow down to show that its planting on the VT page, but no distance being accumulated.  I need the distance so I can calibrate the speed????