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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.
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