HMS Mersey is a British River Class fast offshore patrol vessel of 1677 tonnes displacement used for fisheries protection. HMS Mersey is powered by two Ruston 12RK 270 main engines providing a top speed of 20 knots and a range of 7800 nautical miles at 12 knots. Armaments consist of one 20mm British Manufacturing and Research Company (BMARC) KAA Gun and two General Purpose Machine Guns. HMS Mersey carries a complement of 30 plus a Royal Marine boarding party. Research HMS Mersey
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