GSL/GRSE series of Interceptor Boats
GSL/GRSE series of Interceptor Boats are Indian high speed patrol boats assembled by Garden Reach Shipbuilders & Engineers Limited (GRSE), Kolkata and Goa Shipyard Limited (GSL), Goa. They were designed by Greek shipbuilder, Motomarine, later on GRSE bought this design. GRSE is assembling it at its shipyard in the Bay of Bengal, whereas GSL is also simultaneously assembling the same boats in its Arabian Sea yard. They are being built as per the contract contracted by GSL and GRSE with Ministry of Home Affairs in March, 2008 for various state marine police under the  Coastal Security Scheme. The armoring of the patrol boats is being done by MKU Pvt Ltd. Variants. There are two variants of GSL/GRSE Interceptor Boat: "Hell raisers" and "Invaders". Hell Raiser. The 12-tonne vessel is built of glass-reinforced plastic, has a length of 13 metres with maximum draught at full load 0.90 m and has a bulletproof cabin. It has a water-jet propulsion giving high speed and ability to operate in shallow water. The vessel endurance is 75 nautical miles and can further cover 25 nautical miles with the help of reserved fuel. The vessel can  travel at the maximum speed of 35 nautical miles per hour. The boats are highly seaworthy, unsinkable type (having 10% reserve buoyancy even when filled with water) and are able to sustain operation up to sea state 3 in open sea and also in breaking sea waves near the coast while in shallow water. The vessel is equipped with ultra modern navigation and GPS (Global Positioning System) and can carry a crew of 4 with patrol party of 16. It has facilities for mounting light machine guns and other weapons on board. The per unit cost of vessel is Rs . 25 million (2010). Invaders. Invaders is 9.60 m in length, have weight of 5 tonnes and is capable of operating at 35 knots on full load. It have maximum draught of 0.65 m at full load. It can carry four crew members along with a patrolling party of 10 persons and is equipped with life saving, fire fighting and communication facilities. The boat is fitted with two outboard motors of 275 hp each for propulsion and maneuvering. The per unit cost of vessel is Rs. 10-11 million (2008).