The CRN-91 Naval gun is gyro stabilized and is directed by electro-optic fire-control system of Bharat Electronic LTD make for day and night use, mounted on an improvised cupola. It can also be remotely operated. The CRN-91 Naval gun is not a sophisticated weapon but its operational cost is very low. It is suited for vessels primarily designed for peacetime patrolling and policing, particularly for anti-insurgency, anti-smuggling, anti-pirate and maritime surveillance of exclusive economic zones. It has been installed on many small warships such as:
The Topaz, a Trinkat class patrol vessel of the Seychelles Coast Guard, was sent out on an anti-piracy patrol during late March as part of a new initiative by the Government of Seychelles to combat the steady increase in Somali piracy. The Topaz was a former Indian Navy ship which was given to the Seychelles Coast Guard to help them combat piracy. On 30 April, the Topaz approached a captured vessel where nine Somali pirates were holding six Seychellois and 21 Iranian sailors hostage, and were attempting to reach the Somali coast. A Somali translator aboard the Topaz sent audio calls urging the immediate release of the hostages, but the pirates ignored these demands, and continued towards the coast of Somalia even when warning shots were fired by the Topaz. Seychellois President James Michel gave the order to prevent the pirates from reaching the Somali coastline at all cost. The pirates opened fire on the Topaz with rocket-propelled grenades, which the Topaz evaded. The Topaz then opened fire on the dhow's engine with 12.7mm machine guns, firing a total of 100 rounds. The engine caught fire, forcing all of the pirates and hostages to jump overboard. The Topaz then rescued all of the hostages and arrested the Somali pirates. While en route back to the Seychelles, the Topaz was approached by Somali pirates in a naval trawler and two skiffs. The pirates opened fire on the Topaz, after which the Topaz returned fire. The pirate trawler caught fire and exploded after being hit, and a skiff was also sunk by the return fire, while the last skiff managed to escape. The Topaz then proceeded to Mahé.
In January 2011, as a part of Operation Island Watch, INS Cankarso and INS Kalpeni were deployed on anti-piracy patrol to the west of the Lakshadweep archipelago. On 28 January, INS Cankarso responded to a mayday call from a container ship. Upon reaching the site, she saw Somali pirate skiffs being hoisted aboard a hijacked Thai fishing trawler, Prantalay 14 which was being used as a pirate mother ship. INS Cankarso ordered the pirated ship to stop for inspection. The pirates on board fired on Cankarso as they tried to flee west towards Somalia. Cankarso returned the fire, which hit some of the fuel drums stored on Prantalay 14's deck for refueling the skiffs. The mother ship was set ablaze and sank as Kalpeni and Indian Coast Guard patrol vessel ICGS Sankalp reached the site. 15 pirates were arrested, and the 20 crew of the fishing trawler were all rescued unharmed. In another operation on 13 March 2011, an Indian Navy patrol aircraft spotted the Mozambique-registered fishing vessel Vega 5 when responding to another vessel reporting a pirate attack. Beira-based Vega 5, owned by Spanish company Pescamar Lda, had been captured on 27 December 2010 by pirates who were demanding US$1.8 million in ransom. INS Kalpeni intercepted the pirated ship about 1,100 kilometres off Kochi on India's west coast. A fire broke out on the vessel when Kalpeni returned fire after being fired upon by the pirates. 61 pirates were rescued and arrested after they jumped into the Arabian Sea to escape the fire. The crew of Kalpeni put out the fire on board the Vega 5, rescued her 13 crew members and escorted her to Mumbai. Rocket-propelled grenades and over 80 assault rifles were recovered from the pirates. INS Kalpeni and INS Cankarso are Car Nicobar class fast attack craft equipped with a CRN-91 30 mm Automatic gun.
Specification
Caliber: 30 mm
Diameter: 2700 mm
Height: 2100 mm
Gun feed: Double belt separate
Rate of Fire
Sustained: 200 to 300 rounds per min
Maximum: 550 rounds per min
Range
Armour-piercing tracer projectile: 2000 m
HE incendiary and fragmentation tracer projectile: 4000 m
