Where Am I ?

[TASP]

(Look out, another reminisce from my Grandpa is coming)

I recall being told of a corn planter he had 'back in the day' that required a knotted wire to be strung across the field and moved every pass the tractor made across the field. As the planter was pulled across the field, the knot would trigger a single kernel to be dispensed in each of the 4 rows simultaneously.

The idea was, with all the corn stalks aligned in rows and their positions along the rows all synchronized, a cultivator could be pulled across the field twice in perpendicular directions to knock out more weeds.

IOW, the planter always 'knew' where it was relative to all the seeds already planted and maintained the alignment all the way across the field.

So, fast forward 70 years or so, and a new generation of engineering is being applied to this interesting challenge and I'm eager to see how this thread develops.