Sea Zenith is a four-barrelled 25 mm CIWS It was developed in the 1980s by Oerlikon Contraves around their Oerlikon KBB gun and manufactured in Switzerland. Before 1989 it was known as the Sea Guard. This automatic gun uses a 25x184mm cartridge at a rate of 800 rounds a minute. Using four independent guns instead of one multi-barrelled rotary cannon improves reliability. The system is mounted in an enclosed automatic turret and directed by the Seaguard radar developed by Contraves. The turret is tilted back to allow a higher elevation to intercept diving missiles. The system's primary purpose is defence against anti-ship missiles, and other precision guided weapons. However it can also be employed against fixed/rotary wing aircraft, ships and other small craft, coastal targets, and floating mines.