Well, for one when your going up against a force of well networked advanced systems, the use of ARM's isn't as threatening as it might first seem.
Each ship can use their radar in an intermittent setting, timing them so when one ship/aircraft/etc. stops emitting to prevent an ARM from hitting it, another ship/plane/etc. turns it's on to keep track of the threats.
Bonus if the arm's are not advanced and decide to maneuver to the new emitter, then back to the original, then to a 3rd one, each time expending fuel and losing the kinetic energy to possibly reach the target, which by the way is probably a maneuvering set of targets geographically spaced just to make it more interesting for the arms.
Don't forget false target emitters, deception repeaters and other decoys as well.
Warning, link below has enough math to kill a man...
The SLQ-32(V) is the principal EW system carried by major US Navy surface ships, with more than 450 systems produced to date. The (V)1 and (V)2 suites are passive, providing early warning, identification and direction finding capability for simultaneous multiple threats. The (V)3 suite provides an additional active response for simultaneous jamming of multiple threats. The (V)4, an expanded version of the (V)3, is used on aircraft carriers. The (V)5, used on destroyers and frigates, integrates a passive (V)2 with an active jammer called "Sidekick." The SLQ-32(V) system has been in operation around the globe since the 1980s, and ongoing efforts to restore and upgrade older systems will extend the life of the SLQ-32(V) well into the 21st century.
The system achieves EW objectives by providing full threat band frequency coverage, instantaneous azimuth coverage, 100 percent probability of intercept and simultaneous response to multiple threats. It can detect aircraft search and target radars well before they detect the ship. The system's rapid response time ensures that jamming protection is enabled to prevent long range targeting of the ship and to deceive missiles launched against the ship. The system has an on-line library of emitter types for rapid identification.
Raytheon recently teamed with Lockheed Martin to compete for the U.S. Navy's Surface Electron Warfare Improvement Program (SEWIP) Block 3 program. SEWIP Block 3 will upgrade the fleet's capability to electronically attack anti-ship missiles with the AN/SLQ-32(V) electronic warfare system.
< Message edited by AlmightyTallest -- 3/5/2016 2:10:26 PM >