The documentation provided by a GPS system could be used to show that the product or field work was applied in specific locations at a specific time. Setbacks speci¬fied by regulatory agencies and other sensitive areas (such as ornamental crops, nurseries, gardens, schools, and residential areas) may be defined as “no-apply zones.” The “as-applied” map includes areas in which application occurred and rates can be recorded. It is possible to include not only position, but time and date information in an application record as well. Such documentation could be used for accurate recordkeep¬ing for agrochemical application and machine opera¬tion and, potentially, for regulatory and legal defense purposes.