21. In addition, RCN vessels were incapable of operating gyrocompasses, making ASDIC attacks more difficult. 22. The escorts made an asdic contact on 2 May, which the destroyer and minesweeper attacked. 23. Submarines were slow while submerged, and ASDIC sets did not operate effectively at speeds of over. 24. Her anti-submarine features included ASDIC , a hydrophone, and four depth-charge throwers. 25. ASDIC Type 144 was carried for search and attack functions with Type 147B used for depth finding.26. She spent some time as an ASDIC training target, then was put into reserve at Londonderry. 27. She was subsequently sunk as an ASDIC target off the Isle of Wight on 29 July 1959. 28. Anti-submarine sensors included sonar ( or ASDIC ), although training in their use was indifferent. 29. The ships are equipped with VDS ( Variable Depth Sonar ), formerly known as dipping asdic ." 30. In April 1963 she collided with a wharf when docking in Brisbane, damaging her ASDIC sonar equipment.
