Farmers face the challenge of complying with complex buffer zone requirements when applying crop protection products. Our nationwide assistant system supports compliant, sustainable, and resource-efficient application. Using web services and region-specific regulations, the software generates site-specific application maps, simplifying both planning and documentation. Developed in close collaboration with farmers, advisors, and authorities, the system has been thoroughly field-tested and optimized for effectiveness, user-friendliness, and reliability. We look forward to presenting the current development status of the assistant system and discussing the results with you.