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C3 is a highly advanced computer system that distributes Radar readings to any teammates in range.
C3 takes the user's radar and sensor information and distributes it to friendly units, augmenting and extending their radar. C3 is most often found on heavily specialized Light Mechs, like the Raven or Cougar.
C3 in examples
C3 has range of 1000 meters.
Recon A with standard radar can share data with Player - it's radar range is 1000meters, so he can exactly see where's the further point he can go to share the data with Player.
Recon B has BAP mounted extending his radar range up to 1250 meters (marked blue). Despite of having Player in radar range he cannot share the data because C3 range isn't enhanced by additional equipment, being always only 1000 meters (marked bright blue).
C3 data can be passed from one C3 unit to another C3 and than to regular (process called "chaining"). In this example all mechs have standard radar - it's range (1000meters) is marked blue - and a C3 unit.
Player can see the radar data of Recon A but also Recon B thanks to chaining. However the Recon C doesn't share data with any unit - he must have friendly within 1000meters, not just cover part of the radar range of the another.
C3 was introduced in Beta 0.1.0 and by the time was avaible only on certain variants of Raven and Cougar. With the release of Beta 0.2.0 additional light mechs got C3 units, as well as each C3 could now chain itself with another within range.
Though C3 technically uses a master/slave network in which all units must equip C3 to share Radar, MWLL simplifies the process for gameplay's sake. Game C3 units are actually closer to BattleTech C3i - Improved C3 units being combined Slave and Master without the Target Acquisition capability like the regular C3 Master/Slave set got.