I had came up with the idea mowing a neighbors lawn during my school years when I was 14ish many years ago to use GPS for mowing lawns and fields. I emailed john deer about the idea 20 years ago and they are currently using it in their farm equiptment.
I recently re-emailed them to see if I qualify for any extra money or royaltys.
I am currently waiting for centimeter accurate GPS to start my own ventures. The ublox m9 sounds promising, there are also some phones with the capability.