The Close Range Naval-91 is a naval version of the Medak 30mm automatic gun installed on the Sarath Infantry fighting vehicle, a variant of the Russian (originally Soviet) BMP-2 manufactured in India under license by the AVANI.

A BPK 2-42 electro optical sight manufactured by Bharat Electronics Limited (BEL) directs the cannon, and the complete unit is gyrostabilized in the pitch and yaw axes.

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 (EEZ).

Seychellois President James Michel gave the order to prevent the pirates from reaching the Somali coastline at all cost.

[2] While en route back to the Seychelles, the Topaz was approached by Somali pirates in a naval trawler and two skiffs.

The mother ship was set ablaze and sank as Kalpeni and Indian Coast Guard patrol vessel ICGS Sankalp reached the site.

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.

[15] INS Kalpeni intercepted the pirated ship about 1,100 kilometres (680 mi) off Kochi on India's west coast.