The third AtlantOS Briefing Paper focuses on recent activities of the EU H2020 project AtlantOS to promote discussion about new technologies and making those technologies accessible for ocean observing. Christoph Waldmann and Jan-Stefan Fritz give a short introduction to the topic. Jay Pearlman explains the need for ocean best practices in technologies. The AtlantOS ‘Sensors an Instrumentation Roadmap’ is presented by Andrew K. Morris and Doug Connelly. Finally, Eric Delory introduces technological solutions for sharing instruments and real-time data across Atlantic observing networks. We hope you enjoy this third briefing paper. For questions, please contact us at: firstname.lastname@example.org.