Either way, once set it proved accurate. I did thirty acres before the rain settled in. The rain was actually welcome. I was hoping for a couple days of misty rain to let things even out a bit. Oddly enough, that is just what I got.
Miracles do happen.
After about 350 acres of crop the data card was almost full, so I swapped it for an empty one and brought the full one home to load into the computer. I got a new computer since I did the first yield map on wheat and had to reload the software. Plus, I'd pretty much forgotten the procedure. I did fine, up until I had to download the raw data off the memory card. At that point the computer would freeze up, and I would have to reboot.