A commercially available cotton yield mapping system from Micro-Trak and an experimental cotton yield mapping system developed by the Texas Agricultural Experiment Station were evaluated in 1999 on cotton strippers in the Southern High Plains. The systems were evaluated for ease of use, maintenance requirements and accuracy of yield measurements. The yield estimate accuracy was determined by comparing hand sampled estimates from those of the yield map. Multiple hand samples were obtained at each site, and the 95 percent confidence interval for the yield estimates was established to be 110 lbs lint/ac. For both the Micro-Trak and the TAES systems, the sample and mapped estimates were equivalent on only about half of the sample sites.