The ships are fitted with American Aegis weapons technology allowing them to track hundreds of airborne targets simultaneously as part of its air defence network. The F100 Álvaro de Bazán-class multi-role frigate is one of the few non-US warships to carry the Aegis Combat System and its associated AN/SPY-1 radar. Japan's Kongō class, South Korea's Sejong the Great class, the F100-derived Norwegian Fridtjof Nansen class of frigates also use the Aegis system.