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French F70 type frigates (here, La Motte-Picquet) are fitted with VDS (Variable Depth Sonar) type DUBV43 or DUBV43C towed sonars

Sonar (oreeginally an acronym for SOund Navigation And Ranging, Inglis: SOond Navigation An Rangin) is a technique that uises soond propagation (uisually unnerwatter, as in submarine navigation) tae navigate, communicate wi or detect objects on or unner the surface o the watter, sic as ither veshels.