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{{for|the bibliographic database about the geosciences|GeoRef}}
{{Refimprove|date=September 2012}}
{{short description|Grid-based method of specifying locations}}
The '''World Geographic Reference System''' ('''GEOREF''') is a [[geocode]], a grid-based method of specifying locations on the surface of the [[Earth]]. GEOREF is essentially based on the geographic system of [[latitude]] and [[longitude]], but using a simpler and more flexible [[notation]]. GEOREF was used primarily in [[aeronautical chart]]s for [[air navigation]],<ref>{{cite report |author=DMA |author-link=Defense Mapping Agency |date=20 September 1990 |title=Defense Mapping Agency Technical Manual |series=TM 8358.1 |chapter=Chapter 5: Geographic Coordinate References |chapter-url=http://earth-info.nga.mil/GandG/publications/tm8358.1/tr83581c.html#ZZ38 |access-date=2016-12-16}}</ref> particularly in military or inter-service applications, but it is rarely seen today.{{cn|date=October 2020}} However, GEOREF can be used with any map or chart that has latitude and longitude printed on it.▼
== Quadrangles ==
▲The '''World Geographic Reference System''' ('''GEOREF''') is a [[geocode]], a grid-based method of specifying locations on the surface of the [[Earth]]. GEOREF is essentially based on the geographic system of [[latitude]] and [[longitude]], but using a simpler and more flexible [[notation]]. GEOREF was used primarily for [[air navigation]],<ref>{{cite report |author=DMA |author-link=Defense Mapping Agency |date=20 September 1990 |title=Defense Mapping Agency Technical Manual |series=TM 8358.1 |chapter=Chapter 5: Geographic Coordinate References |chapter-url=http://earth-info.nga.mil/GandG/publications/tm8358.1/tr83581c.html#ZZ38 |access-date=2016-12-16}}</ref> particularly in military or inter-service applications, but it is rarely seen today. However, GEOREF can be used with any map or chart that has latitude and longitude printed on it.
GEOREF is based on the standard system of [[latitude]] and [[longitude]], but uses a simpler and more concise notation. GEOREF divides the Earth's surface into successively smaller quadrangles, with a notation system used to identify each quadrangle within its parent. Unlike latitude/longitude, GEOREF runs in one direction horizontally, east from the 180° [[meridian (geography)|meridian]]; and one direction vertically, north from the [[South Pole]]. GEOREF can easily be adapted to give co-ordinates with varying degrees of precision, using a 2–12 character [[geocode]].
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