In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Steel wrote:

You could do this with 1 GPS Module and an RF Link.

The User can have a handheld that contains a GPS module, RF Link, and a main processor.

*Roughly*...
The main processor reads the GPS, and stores the coordinates in a "Forward, Backward, Left, Right"-type command set (with timing intervals).  (reads new GPS coordinate, compares it to the last coordinates, calculates difference and tells direction)

The Directions are then sent to the vehicle via an RF Link.  A processor on the tractor then runs the tasks based on the forward, Backward, Left, Right commands.

There will have to be some tweaking on the timing, but this solution *may* have the vehicle run the same patterns that the GPS Stored.

But Please...If this is dangerous equipment, such as a tractor or lawnmower...Second think the project.  There have been people seriously hurt by trying to automate equipment.

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