The Umbani is a precision-guided bomb kit manufactured by Denel Dynamics in South Africa. It consists of a number of modules fitted to NATO standard Mk81, Mk82 or Mk83 low drag free-fall bombs to convert them into guided glide bombs.
Umbani PGM on display at the Test Flight and Development Centre of the South African Air Force Airshow in 2012
Precision-guided munition
A precision-guided munition (PGM), also called a smart weapon, smart munition, or smart bomb, is a guided munition intended to hit a specific target, to minimize collateral damage and increase lethality against intended targets. During the Persian Gulf War guided munitions accounted for only 9% of weapons fired, but accounted for 75% of all successful hits. Despite guided weapons generally being used on more difficult targets, they were still 35 times more likely to destroy their targets per weapon dropped.
A laser-guided GBU-24 (BLU-109 warhead variant) strikes its target
BOLT-117, the world's first laser-guided bomb
Diagram showing the operation of a laser-guided ammunition round. From a CIA report, 1986.
A F-22 releases a JDAM from its center internal bay while flying at supersonic speed