Guide to ECM Warfare in Eve Online

Tracking Diagnostic Subroutines - increase tracking speed of own ship and optimal range disruption of Tracking Disruptors but has decreased shields as a drawback.

Drones used:
Acolyte TD-300 (light)
Infiltrator TD-600 (medium)
Praetor TD-900 (heavy)

Modules used as a countermeasure:
Tracking Computers

Rigs used as a countermeasure:
Tracking Diagnostic Subroutines - increase tracking speed of own ship and optimal range disruption of Tracking Disruptors, but has decreased shields as a drawback.

How it works:
Tracking disruptors reduce both the optimal range and the tracking ability of the target's turrets.

How the countermeasure works:
Tracking computers increase the optimal range and tracking ability of the ship's turrets.

Sensor dampening
Favoured by:
some Gallente ships

Modules used:
Remote Sensor Dampeners

Rigs used:
Inverted Signal Field Projectors - increase effect of Sensor Dampeners, but have decreased shields as a drawback.
Particle Dispersion Augmentors - increase optimal range of Electronic Warfare modules, but have Eve Isk decreased shields as a drawback.

Drones used:
Hobgoblin SD-300 (light)
Hammerhead SD-600 (medium)
Ogre SD-900 (heavy)

Modules used as a countermeasure:
Sensor Boosters
Signal Amplifiers
Remote Sensor Boosters (work on a target ship but don't benefit the own ship)

Rigs used as a countermeasure:
Ionic Field Projectors - increases targeting range, but has decreased shields as a drawback.
Targeting System Subcontrollers - increases targeting speed, but has decreased shields as a drawback.

How it works:
Remote Sensor Dampeners lower the maximum targeting range and the sensor resolution of the target ship. The result is that the targeting range of the other ship is reduced and it also takes a longer time for it to get Eve Isk a target lock once it gets in range.

How the countermeasure works:
Targeting range and speed get enhanced with Sensor Boosters being more effective than Signal Amplifiers. The downside is that they use capacitor.
Target painting
Favoured by:
some Minmatar ships