The small friendly buoy

sfy-buoy (v3) - the firmware for the wave buoy. pre-built binaries available under releases. hardware and build-tutorial - hardware and assembly instructions. sfy-data - the server scraping or receiving data from deployed buoys. sfy-processing - python libraries and tools for reading and post-processing received data. sfy-dashboard - web interface for displaying latest position and overview of buoys. Some notes on getting started.

The buoys deployed in the surf at Nazaré and on the coast of Norway:

For more information and attribution, please refer to:

• Hope, Gaute, et al., 2025, SFY—A Lightweight, High-Frequency, and Phase-Resolving Wave Buoy for Coastal Waters, J. Atmos. Oceanic Technol., 42, 133–154

• Cavaleri, Luigi, et al. 2025. More Room at the Top: How Small Buoys Help Reveal the Detailed Dynamics of the Air-Sea Interface. Bulletin of the American Meteorological Society. March 28.

• Seldal, Torunn Irene, M. Sc. thesis, 2023, SFY: A free-drifting wave buoy for measuring surf waves

Press

• met.no - Drømmen om monsterbølgene
• surf-norge.no - Professor Bølges betraktninger
• met.no - Morgendagens fiskere utdanner seg til en framtid med store endringer | UiT
• met.no - Surfer rundt i verden for å måle hvordan bølger bryter

Acknowledgements

This work is inspired by the OpenMetBuoy-v2021a, see Rabault et. al. (2022).