USBL directional receiver (top) and interrogation transmitter (bottom), lifted out of the water for inspection and transit between sites.
USBL Directional Receiver and Interrogation Transmitter
Image courtesy of Microbial Stowaways. Download larger version (jpg, 3.8 MB).

USBL directional receiver (top) and interrogation transmitter (bottom), lifted out of the water for inspection and transit between sites.

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