OVERVIEW: K/SLQ‑261 is an expendable, acoustic torpedo decoy system deployed by Republic of Korea Navy vessels. It emits false acoustic signals to lure torpedoes away from the ship.

DETAILS: The “SLQ” designation follows the U.S. Navy’s nomenclature for electronic warfare systems, adapted by Korea. K/SLQ‑261 emits broadband acoustic pulses mimicking propulsion and machinery noise, or responds with counter-pings to active sonar-serving to deceive passive and wake-homing torpedoes, providing a stand-off lure. Its primary role is to increase ship survivability by drawing torpedoes away from actual hull signatures.

FONCTION: Launched via stern-mounted tubes, units float or tow behind the ship and autonomously emit acoustic signals tailored to the threat environment. Ships typically deploy multiple decoys in sequence to maintain continuous lure while maneuvering.

SOURCE: Incheon-class frigate specification sheet (Wikipedia) https/www.wikipedia.org/wiki/Incheon-class_frigate ; Daegu-class frigate systems listing (Wikipedia) https/www.wikipedia.org/wiki/Daegu-class_frigate ; Pohang-class corvette countermeasure details (seaforces.org)