Security ratings:
* -1.9 and above: you can enter all space freely
* -2.4 and above: you can enter all but 1.0
* -2.9 and above: you can enter all but 0.9 and above
* -3.4 and above: you can enter all but 0.8 and above
* -3.9 and above: you can enter all but 0.7 and above
* -4.4 and above: you can enter all but 0.6 and above
* -4.5 or lower: yer pretty much fooked.

Sensor Types for ECM

Minmatar - Ladar
Caldari - Gravimetric
Gallente - Magnetometric
Amarr - Radar

ECM Formula

C = (1-(1-J/S)^n)*100%

J is the jamming strength of your jammer
S the sensor strength of the target ship
n the number of jammers
C the jamming chance in %