ECM Suite
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An Electronic Countermeasure (or ECM) suite covers the area around the unit on which it is employed, disrupting sensors and communications. ECM Suites exist for BattleMechs, Battle Armor, Combat Vehicles, and AeroSpace Fighters. The most widely-deployed ECM Suite is the Guardian.
Game usage
In Tournament-level gameplay, the use of an ECM suite is to nullify the effects of other electronics, such as missile beacons, active probes, and fire control systems. It can also cut a unit off from a C3 network.
In Tactical Operations, additional uses for an ECM suite are shown as optional rules, including defeating other ECM and generating ghost targets.
In MechWarrior IV: Mercenaries, the ECM is a selectable component for certain 'Mechs. It increases missile lock time for enemies and reduces the range at which the 'Mech can be detected.
In MechCommander 2, the ECM is also a component for certain 'Mechs. It makes the 'Mech in question undetectable by sensors. It appears to have no effect on missiles, due to the way in which the game handles weapons fire.