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tech The technology used for CeNCOOS high-frequency radar (HFR or HF radar) observations is very different than that typically used to measure currents, i.e. placing current meters in the water at a few strategy locations. Instead, land-based antennas are positioned to emit low-energy radio signals that bounce off of ocean waves and are returned to receiving antennas. The time delay, direction, and wavelength change (Doppler shift) of the returning signals allow calculation of the location, speed, and bearing of surface currents.