page_title: LÉ Róisín (P51)
section_title: Weapon systems
hierarchical_section_title: LÉ Róisín (P51) / Weapon systems
caption_attribution_description: English: Bow Otobreda 76 mm gun of Irish offshore patrol ship LÉ Róisín (P51) photographed in Helsinki. Suomi: Irlantilaisen partioalus LÉ Róisín (P51) Otobreda 76 mm keulatykki kuvattuna laivastovierailulla Helsingissä.
context_page_description: LÉ Róisín (P51) is the lead ship of her class of offshore patrol vessel in the Irish Naval Service. Commissioned in 1999, the ship's primary mission is fisheries protection, search and rescue, and maritime protection operations, including vessel boardings. Róisín or Róisín Dubh, is often used as an allegory for Ireland. However the original Róisín Dubh was a daughter of Red Hugh O’Neill, Earl of Tyrone in the late 16th century.
context_section_description: The ship is armed with an OTO Melara 76 mm gun dual purpose gun installed on the bow gun deck. The gun fires 6 kg (13 lb) shells and is capable of firing up to 85 rounds per minute to a range of over 15 kilometres (9.3 mi). There are also two 12.7 mm machine guns and two 20 mm Rheinmetall Rh202 cannon for anti-aircraft defence.
  The main gun is controlled by an Ultra Electronics Command and Control Systems, Radamec 1500 optronic director with a daylight TV camera, thermal imaging camera and eyesafe laser rangefinder. System 1500 functions in automatic or manual mode. The system provides fire control for surface engagement with spotting corrections in both line and range and has an effective secondary self-defence anti-air capability. System 1500 can detect a small patrol boat at ranges in excess of 12 kilometres (7.5 mi), night or day. The ship's Kelvin Hughes surface search radar, operating at E, F and I bands, is installed high on the main mast over the bridge. The Kelvin Hughes navigation radar operates at I-band.
caption: Otobreda 76 mm bow gun of LÉ Róisin
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