Standard sensors make use of radar, normally passive.

All civilian vessels continuously broadcast a transponder signal. It can generally be picked up within 30Mkm with civilian sensors, or 100Mkm with military grade sensors.

Military ships will often switch off their transponders when on a mission, though it is against Imperium law for civilian ships to do so.

The transponder signal carries the ID of the ship, and where it was registered, and has enough information to work out the heading of the vessel.

Starports will generally have high quality sensor arrays that allow them to monitor most of the star system.

They have neutrino sensors which allow them to detect a ship's jump (either out, or in).

• Transponder signals with 100 AU.

• Transponder signals with 30 AU.

• Transponder signals with 10 AU.