The Joint Direct Attack Munition is 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 receiver for enhanced accuracy, giving them a published range of up to 15 nautical miles from the release point. The guidance development program is a joint United States Air Force and United States Navy effort, hence the "joint" in the name. 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[citation needed], because of their suitability for attacking certain types of targets.

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