Northrop Grumman Corporation has won a contract to supply high-accuracy inertial navigation systems (INS) for four new Buques de Acción Marítima (Maritime Action Ships) being built for the Spanish navy at the Navantia shipyard in Ferrol, northwest Spain.The contract, valued at more than $1.5 million, was awarded by Navantia to Northrop Grumman’s Sperry Marine business unit. Installation, commissioning and trials will be overseen by Aeromarine, Sperry Marine’s sales and service representative in .Each of the ships will be fitted with one MK 39 Mod 3A ring laser gyro (RLG) INS and one MK 27 fiber-optic gyrocompass. The MK 39 Mod 3A will…