World Geographic Reference System
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world geographic reference system[′wərld ¦jē·ə¦graf·ik ′ref·rəns ‚sis·təm]
A geographic reference system used by the U.S. Air Force for aircraft position reports, target designations, and other tactical air operations. Abbreviated georef.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
World Geographic Reference System (GEOREF)
GEOREF. The system may be applied to any map or chart graduated in latitude and longitude regardless of projection. It is a method of expressing latitude and longitude in a form suitable for rapid reporting and plotting. The system is based on the division of the entire earth's surface into a number of quadrangles and subquadrangles. The first division is into 24 longitudinal zones, each 15° wide. They are lettered A to Z inclusive, omitting I and O, and commence eastward from the 180° meridian. Similarly, the earth is divided into 12 latitudinal bands, each 15° wide. They are lettered A to M, omitting I. The letters commence northward from the south pole. Each 15° quadrangle is further subdivided into 15 one-degree longitudinal zones and latitudinal bands. They are lettered A to Q inclusive, omitting I and O, and commence eastward and northward, respectively, from the southwest corner of the 15° quadrangle. Each of the subquadrangles is identified by means of four letters. The first two letters identify the 15° quadrangle, the third letter the one-degree zone of longitude, and the fourth letter the one-degree band of latitude. The one-degree quadrangles are further divided into 60 longitudinal zones and 60 bands of latitude—each one-minute of arc. Anyplace in this one-minute quadrangle is identified by quoting four letters and four numerals. The four letters denote the one-degree quadrangle; the first two numerals, the minutes of easting; and the remaining two numerals, the northing of the position within the one-degree quadrangle. In practice, where the risk of ambiguity with a neighboring 15° quadrangle I is unlikely, the first two letters of the reference may be dropped.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved