The Maidenhead Grid Locator system (also QTH) is a geographic co-ordinate system used by amateur radio operators to succinctly describe their location.
The system can describe any location in the world. Latitudes and longitude can be coverted to and from the grid system
John Morris G4ANB originally devised the system and it was adopted at a meeting of the IARU VHF Working Group in Maidenhead, England in 1980
*In simple term, Maidenhead Grid is use to give your location quickly to another amateur radio operator outside of your country. This is use during HF or satelite communication where you only have few minutes to communicate with people around the world and provide your QTH.
