Stacking Penalities
1st mod: 100,000% effectiveness
2nd mod: 86,9119842% effectiveness
3rd mod: 57,1037996% effectiveness
4th mod: 28,2469117% effectiveness
5th mod: 10,5988834% effectiveness

ECM:
Min - Ladar
Cal - Gravimetric
Gall - Magnetometric
Amarr - Radar

Damage to deal:
Angel Cartel: Explosive
Blood Raiders: EM
Guristas Pirates: Kinetic
Mordu's Legion; Kinetic
Sansha's Nation: EM
Serpentis: Kinetic
Amarr: EM/Therm
Caldari: Kinetic/Therm
Gallente: Therm
Minmatar: Therm

What to resist:
Angel Cartel: Explosive
Blood Raiders: 50% EM, 50% Therm
Guristas Pirates: 80% Kinetic, 20% Therm
Mordu's Legion; 70% Kinetic, 30% Therm
Sansha's Nation: 50% EM, 50% Therm
Serpentis: 55% Therm, 45% Kinetic
Amarr: 55% EM, 45% Therm
Caldari: 50% Kinetic, 50% Therm
Gallente: 60% Kinetic, 40% Therm
Minmatar: 50% Explosive, 50% Therm
Drones: easy: EM/Therm, hard: Explosive/Kinetic