The Maidenhead Locator System (a.k.a. QTH Locator and IARU Locator) is a geocode system used by amateur radio operators to succinctly describe their geographic coordinates, which replaced the deprecated QRA locator, which was limited to European contacts.[1] Its purpose is to be concise, accurate, and robust in the face of interference and other adverse transmission conditions. The Maidenhead Locator System can describe locations anywhere in the world.
Maidenhead locators are also commonly referred to as QTH locators, grid locators or grid squares, although the "squares" are distorted on any non-equirectangular cartographic projection. Use of the terms QTH locator and QRA locator was initially discouraged, as it caused confusion with the older QRA locator system. The only abbreviation recommended to indicate a Maidenhead reference in Morse code and radio teleprinter transmission was LOC, as in LOC KN28LH.[1]
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.[2]
^ abEckersley, R.J., G4FTJ (1985). Amateur Radio Operating Manual (third ed.). Potters bar, UK: Radio Society of Great Britain. pp. 64–66. ISBN 0-900612-69-X.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
^Cite error: The named reference QRZ.RU-Locator_System was invoked but never defined (see the help page).
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2010-12-12. Anthony Simmonds (2010). "Control Numbers on British Stamps". Maidenhead & District Philatelic Society. Archived from the original on 29 November...
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