OTN Conducts VR4 Communication Tests in the Strait of Gibraltar

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VR4 test mooring is recovered

In early April 2012, OTN began the test phase of its Strait of Gibraltar Line. Remote communication tests were performed, then four VR4 moorings were deployed in early April and recovered two months later. Each of these moorings used a different type of floatation—OpenSeas Instrumentation SUBS float, Kintama positioning system, Romor CROM, and Romor prototype elliptical float—and each was equipped with a Star-Oddi tilt sensor. Four VR2W moorings were also deployed for comparison, two of which were equipped with temperature–depth sensors and range test tags. Results of the test deployment will be used to determine the most appropriate mooring design for this area.

Several organizations and individuals participated in these tests, including OTN technician Ian Beveridge; Vemco technician Tim Stone; Anna Sanchez Vidal, Antoni Calafat Frau, and Aitor Rumin Caparrós from Universitat de Barcelona, Barcelona, Spain; Jesús Rivera Martínez from Instituto Español de Oceanografía (IEO), Madrid, Spain; and Pauline Gauffier from Conservacion, Informacion y Estudios sobre Cetaceos (CIRCE), Tarifa, Spain.

Full deployment of the OTN Strait of Gibraltar Line is planned for 2013. The Line will consist of 35 VR4 acoustic receivers spanning the Strait between Spain and Morocco. The exact location of the line and mooring design will be based on results of the test phase.

View more photos in the OTN Multimedia Gallery

Story by Susan Dufault, OTN Headquarters

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