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Drifting buoys move with surface currents. They measure sea surface temperature and atmospheric pressure.

Components of a drifting buoy:
• a holey-sock drogue ensures the buoy follows the movements of the water (showing at about 15 m depth)
• a sea surface temperature sensor near the surface
• a tether connecting the sensor to the drogue
• a surface buoy and barometer on top.

The Bureau maintains a fleet of drifting buoys that travel great distances over many years.

Journey of a drifting buoy.
A drifting buoy was deployed on 14 May 2018 between Australia and Indonesia. By 2025 it had travelled across the Indian and Atlantic oceans to the east coast of South America near Rio de Janeiro.

Locations of Bureau drifting buoys.
Drifting buoys are located to the north, west and south of Australia.

Oceans belong to everyone. International agencies share monitoring efforts and data. This data improves forecasts, and is essential for climate monitoring and research, and international shipping.