I'm in a system with an enemy ship using an active sensor S196/R93. The enemy ship is 8m km away from a picket of fighters, one having a R1 active sensor with a range of 1.3m km.
I have no passive sensors in the system, no thermal or grav one.
And yet, I detect the ship. It was detected before because I had a large active sensor, but I pulled it away to another system.
So why I'm still detecting the enemy? Is it a glitch, me not understanding a rule?