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The AMAR is an underwater acoustic and oceanographic data recorder. It consists of recording electronics housed inside a watertight pressure housing. The AMAR can be connected to up to 8 hydrophones sampled at 24-bit resolution at rates up to 128 kHz, and another high-frequency hydrophone sampled at 16-bit resolution at rates up to 687.5 kHz. Oceanographic sensors (e.g., dissolved oxygen, salinity, acidity, temperature) can also be connected, allowing the system to be used as a mini ocean observatory. Two AMARs are used on the East Node of the VENUS ocean observatory in the Strait of Georgia, providing publicly available underwater sound recordings.