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The 'Seagnat' Control System (sometimes spelt 'SeaGnat' or 'Sea Gnat') is a decoy system used on many NATO warships to safeguard against incoming missiles. Each unit consists of six launchers that can be loaded with different rounds, depending on the threat:

★ Mk214 Seduction Chaff

★ Mk216 Distraction Chaff

★ Mk245 IR Round

★ Mk251 Active Decoy Round (only on later "DLH" versions)
The rounds are launched as decoys to trick incoming missiles into missing the ship or to prematurely detonating.
The Active Decoy Round has three phases: a rocket motor to project it away from the ship, a parachute to slow the round, and a parasail wing that allows the decoy to slowly descend to the water. The device is 125mm diameter by 1m long.