A grower asked me to help him calibrate his GS1 ("Little Brown Box", Original GS monitor). He was going to get a GPS unit from his dealer. What is this I hear about "Harvest Doc"? There already is the ability to calibrate the yield monitor but does not appear to have the Harvest Doc option. Does that mean it will measure automatic yield and record totals/averages, but will not MAP the data unless it has harvest doc? Is it a software upgrade? Thanks.