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EM Sensor

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A passive sensor that detects electromagnetic emissions from an Active Sensor (which emits radiation only if switched on). Being passive, an EM Detection Sensor does not give away your position (unlike an Active Sensor).

An EM Detection Sensor can detect emissions at a range of

 EM Sensitivity * 1000km * Signature strength

A passive sensor contact cannot be fired upon. You need an Active Sensor contact for that.


EM sensors excel at finding active sensors. Spotting your opponents actives can give you valuable information about probable weapon ranges. However active sensors can only be detected if they are turned on, so exclusively relying on EM sensors for passives can lead to a fleet being able to sneak up and only turn on their actives with the first volley.

Populations have relatively large EM signatures, making EM sensors useful for spotting colonies. A sense 10 sensor will pick up a strength 5 EM signature at a maximum of 50,000 km, scaling linearly up and down. You can view the passive sensor detection radius of your ships and installations in the System Map's view by adjusting the Sensors tab values.


EM Sensor Sensitivity

Base Sensitivity
Sensitivity 5 6 8 11 14 18 24 32 40 50 60 75
RP cost 1,000 2,000 4,000 8,000 15,000 30,000 60,000 120,000 250,000 500,000 1,000,000 2,000,000

Total Sensor Size

Total Sensor Size ranges between 0.1-50 HS. EM Detector Sensitivity is given by

 Size*Base Sensitivity

Electronic Hardening

Electronic Hardening
Hardening 0 1 2 3 4 5 6 7 8
Chance of Destruction (%) 100 70 50 40 30 25 20 15 10
RP cost 1,000 2,500 5,000 10,000 20,000 40,000 75,000 150,000 300,000


Mor, Whitecold, Zook