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Active Sensors/Fire Control

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Active Sensors and Missile Fire Controls are player-designed components.

  • Active search sensors are a necessity for any fleet. They are needed to target hostiles, and to detect incoming missiles.
  • Missile Fire Controls can only operate in conjunction with an active search sensor. The active sensor does not have to be on the same ship.


An Active Search Sensor is a radar-like instrument that provides 360° coverage and gathers target data by bouncing gravitational pulses off an object and is necessary to provide a Fire Control sensor with target positions.

Increasing a sensor's size increases its power. Active Sensor Strength is the strength per HS of the gravitational pulses sent out by the sensor while EM Sensitivity represents the ability of the sensor to detect the returning pulses. Hardening reduce the chance of destruction by electronic damage from microwave weapons. All these can be increased through research.

Resolution determine the range versus different target sizes. An active sensor is able to detect any ship of a size that is equal to or greater than its resolution at its maximum range. If the target is smaller than the resolution, the maximum detection range is considerably reduced.

Max Sensor Range = Strength x Size x Sqrt(Resolution) x EM Sensitivity/10 x 10,000km
Detection range = Max Sensor Range x (Target Size / Resolution) ^2

So you need to design active sensors based on the role intended for that sensor. An area search sensor might be designed with a large resolution to find large enemy ships while a sensor designed to detect fast attack craft, which weigh 1000 tons or less, would need a resolution of approximately 20. Missile detection sensors are usually resolution one, which is the lowest possible.

It is not possible to hide behind another object (a planet or a wreck, for example) from sensors, but Cloaking technology can reduce the range at which a sensor can spot your ship.

Missile Fire Controls

By changing the sensor type to Fire Control, you build a Missile Fire Control (MFC). It is designed like active sensors, but is unable to detect targets. It emits a concentrated beam of radiation to "illuminate" a target and direct missiles to them. Because of this concentrated beam it has triple the range of a similar-sized search sensor.


Design considerations are discussed in-depth here: Active Sensor Design.


Active Sensor Strength
Strength 10 12 16 21 28 36 48 60 80 100 135 180
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
EM Sensor 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.

Minimum Resolution

Minimum Resolution ranges between 1-500 HS.

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
Active Sensor Type
Type Search Sensor Missile Fire Control
Range Multiplier 1 3
Use Detection Missile Guidance


Chadoftoons, Mor, Whitecold, Zook