Gunggandji-Mandingalbay Yidinji (GMY) Land & Sea Rangers have worked alongside researchers to use the Great Reef Census to fill critical knowledge gaps in their Sea Country, providing data that supports both Traditional Owner aspirations and reef management needs. Over two years, GMY Rangers have systematically surveyed their reefs, using geo-located imagery and AI-assisted analysis to map and assess reef habitats. The program has enabled large-scale reconnaissance-style monitoring of previously unsurveyed reefs, generating baseline data that Traditional Owners can contribute to, interpret, and use for decision-making. Results from these surveys—conducted before and after significant regional bleaching and cyclone impacts in 2024—highlight how ranger-led data collection informs both local stewardship and the broader management strategies for the Great Barrier Reef. This presentation provides insights into how Indigenous-led monitoring strengthens community capacity, enhances collaboration with scientific partners, and delivers actionable knowledge for managing dynamic marine environments. By embedding scalable, practical survey methods into ranger-led programs, this partnership demonstrates a successful model for ongoing, adaptive Sea Country management.