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Signature Radius
Overview
Signature radius is how EVE measures the 'size' of your ship. It determines three very important things:
How quickly ships can lock on to you
How easy you are to locate with combat probes
How easy you are to hit with guns and drones
The larger your signature radius, the bigger your ship. A large sig radius means you are locked onto more quickly and are easier to hit. A capsule has a sig radius of only 25m, meaning it is pretty hard to hit and you lock it slowly. A titan has a massive sig radius of over 10km, meaning you probably won't miss at all (at least not because of sig radius) and you can lock on near instantly.