The class patrol Serviola are a series of four patrol high, also called ocean, belonging to the Spanish Armada. is a modernized version of the class itself Hawk Empresa Nacional Bazan (now Navantia), which were sold in the early 1980s five units to the Naval Prefecture Argentina and six to the Navy of Mexico.
Design requirements of the Spanish Armada were capable of operating at sea for long periods and in rough seas, but it would mean a loss of operational capabilities, for which are provided with two stabilizing fins that makes very few vessels stable. They have flight deck for helicopters capable media, but not to realizarles hangar maintenance, as well as a small hospital for six seats and two RHIB.
To save costs were used to arm them old guns of 76.2 mm Mk.22 disassembled American origin vessels decommissioned by the Navy, which is very limited military value, rather than opt as planned by the much higher Oto Melara Compact 76/62 that manufactured under license itself Bazán. Neither have an advanced fire control, consequently resulting in firepower almost symbolic.
The construction of the head of the class started in the shipyard in Ferrol Bazán in December 1989 and was delivered the last of the four to the Navy in June 1992.
These ships became especially known during the War of halibut, which were sent to protect Spanish fishing approaches of the Canadian Navy. They are also known for their support of the state security forces in the illegal.