Active / Passive sensors

[Arkcon]

Not unless modded. The level 1 sensor penetrates level 1 cloak. Stealth armor provides level 1 passive cloak. A cloaking device provides level 1 active and passive.

This is so hard to explain clearly. The cloaking device does't give any more cloaking than stealth armor provides that a sensor can't penetrate. Or something.

But once you start building ships, it all starts making sense.