We have been using A_l with gleaner since 94 harvest. This fall we did the speed cal as recomended by a_l and felt that we had the best acuracy ever. We also use the a_l for monitoring nh3,planting,spraying, and lime_fert spreading. We have not seen the field star in the field but we know from experiance that the a_l is good. Also very good intallation and instuctions.