I found the campaign page lacking in technical detail, it repeatedly states that it's "accurate", but never becomes more specific than saying "inch-accurate". What does that mean? That the position of the device is tracked with an accuracy of +/- 1 inch? Globally? Without extra hardware "in the field" (such as that used by the tractors discussed here just a few days ago)? The title here uses the word "centimetric", but that's not repeated on the campaign page.

Also, $200 feels expensive to me, but again I'm not in the market, perhaps it's magically cheap if you simply could not do this before, but now you can.