Extended_Range_Guided_Munition
The Extended Range Guided Munition was a precision guided rocket-assisted 5-inch (127 mm) shell (projectile) development by Raytheon for the U.S. Navy. The program was cancelled in March 2008 after twelve years of development and over 600 million dollars in funding.[1] The developmental round was designated EX 171.[2]
ERGM consisted of three major subsections: propulsion (rocket motor), warhead, and Guidance, Navigation and Control section. ERGM is fired from the 127 mm (5 inch) 62 Caliber Mark 45 gun Mod 4, at which point the fins would deploy and the rocket motor would ignite, lifting the munition to at least 80,000 feet (24 km), after which the canards would deploy and guide the ERGM to the target using GPS guidance. It was to be used on Arleigh Burke-class destroyers hulls DDG-81 onward.[3]
A similar system (though for MLRS) developed by SAAB and Boeing reached production in 2019 and is known as the GLSDB.