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* The first level of Georef divides the world into quadrangles each measuring 15 degrees of longitude by 15 degrees of latitude; this results in 24 '''zones''' of longitude and 12 '''bands''' of latitude. A longitude zone is identified by a letter from A to Z (omitting I and O) starting at 180 degrees and progressing eastward through the full 360 degrees of longitude; a latitude band is identified by a letter from A through M (omitting I) northward from the south pole. Hence, any 15 degree quadrangle can be identified by two letters; the easting (longitude) is given first, followed by the northing (latitude). These two letters are the first two characters of a full Georef coordinate.
* Each 15-degree quadrangle is further divided into smaller quadrangles, measuring 1 degree of longitude by 1 degree of latitude. These quadrangles are lettered A to Q (omitting I and O), running from west to east for longitude; and A to Q (omitting I and O), running south to north for latitude. These letters form the third and fourth characters of a full Georef coordinate. Four letters thus identify any 1-degree quadrangle in the world.
* Each of the 1-degree quadrangles is further subdivided into 60 1-minute longitude zones, numbered 00 through 59 from west to east, and 60 1-minute latitude bands, numbered 00 to 59 from south to north. These numbers are always written as two digits, with a leading zero if necessary, and the easting is always followed by the northing. Thus, 4 letters and 4 digits give the position of any 1-minute quadrangle.
* Each of the 1-minute quadrangles may be further divided into 10 or 100 smaller divisions both north–south and east–west, permitting the identification of 0.1-minute or 0.01-minute quadrangles. The Georef coordinate for any 0.1-minute quadrangle consists of four letters and six numbers; the Georef coordinate for any 0.01-minute quadrangle consists of four letters and eight numbers.
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* Right from 180° longitude to longitude zone G
* Up from the South Pole to latitude zone J
* Right in zone GJ to the lettered 1° column P
* Up in zone GJ to the lettered 1° row J
* Right in the 1° horizontal zone to 37 minutes
* Up in the 1° vertical zone to 16 minutes
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