The Alliance for Coastal Technologies (ACT) is a partnership of research institutions, resource managers and private sector companies dedicated to fostering the development and adoption of effective and reliable sensors and platforms for use in coastal, freshwater and ocean environments. ACT priorities include: (A) Transition emerging technologies to operational use rapidly and effectively; (B) Maintain a dialogue among technology users, developers, and providers; (C) Identify technology needs and novel technologies; (D) Document technology performance and potential and (E) Provide a foundation for the US Integrated Ocean Observing System. The ACT Technology Database is a continuously updated catalogue of instrumentation used for coastal and ocean science and observations, designed to help you identify technologies available to meet your specific needs. Search by environmental parameters, sensor types or manufacturers. The public and private sectors have an increasing demand for accurate and reliable environmental observations, which allow for a better basic science understanding, forecasting abilities, and informed management decisions. To meet this demand, the federal government (1) has established operational systems and services, which provide the basis for production and dissemination of official assessments, predictions, and warnings, and (2) supports technology and systems development to improve operational observation capabilities, such as higher quality data through the introduction of new or enhanced environmental sensors.