JDAM

The Joint Direct Attack Munition (JDAM) is a "joint" United States Air Force and United States Navy program that utilizes a guidance kit that converts existing unguided gravity bombs, or "dumb bombs", into all-weather "smart" munitions. JDAM equipped bombs are guided to their target by an integrated inertial guidance system coupled with a Global Positioning System (GPS) receiver for enhanced accuracy, giving them a published range of up to 15 nautical miles (28 km) from the release point. The program's approach was in contrast to earlier laser-guided bomb and imaging infrared technology, both of which can be hindered by adverse ground and weather conditions; however, laser designators are now being fitted to some JDAMS as well, because of their suitability for attacking certain types of targets.