1. In 1985, " Arethusa " was fitted with towed array sonar . 2. In 1984, " Phoebe " completed her towed array sonar refit. 3. They also use a Thales ( Thomson Marconi Sonar ) Sintra towed array sonar . 4. In 1986, the vessel was the testbed for the Experimental Towed Array Sonar System. 5. The Canadian Towed Array Sonar ( CANTASS ) has been integrated into the towed sonar suite. 6. The following year, " Cleopatra " was fitted with the new towed array sonar . 7. It was given a towed array sonar , ASW torpedoes and the ELMA anti-submarine grenade launcher system. 8. She was also one of the few of the class that carried the AN / SQR-15 Towed Array Sonar System. 9. The ship's primary passive ASW sensor was the AN / SQR-19 Tactical Towed Array Sonar ( TACTAS ). 10. Information released from the Severnoye Design Bureau ( SDB ) indicate that French towed array sonars ( TAS ) are also fitted.
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