PNA Prefecto Derbes (GC-28) is a Mantilla-class patrol boat in service with the Argentine Naval Prefecture,[note 1] built at the Empresa Nacional Bazán shipyards and commissioned in 1984.

[1] Prefecto Derbes is one of five Mantilla-class patrol boats ordered by the Argentine Naval Prefecture (PNA) in 1981, corresponding to the coast guard cutter “Halcon II” type, designed and build by the Spanish Empresa Nacional Bazán shipyard.

[1] Prefecto Derbes is equipped with two water cannons for firefighting, anti-contamination gear, active stabilizers and a retractable hangar and landing pad with support facilities for an Alouette-sized helicopter.

[2] Prefecto Derbes was ordered by the Argentine Naval Prefecture (PNA) in 1981 as part of the five-ship Mantilla-class, composed by the patrol boats GC-24 to GC-28.

In August 1991 is assigned to the port of Bahía Blanca, reporting to “Prefectura de Zona Mar Argentino Norte”, replacing her sister ship ”Azopardo".