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Extensions to the above notation allow the GEOREF system to be used to designate an area around a reference point. This is achieved by adding an area designation to a base GEOREF co-ordinate. The area designation can be the letter S, to specify the sides of a rectangle (separated by the letter X); or the letter R, to specify the radius of a circle. In both cases the units are nautical miles. In addition, the letter H can be added, followed by an altitude in thousands of feet.
For example, the reference GJQJ0207S6X8 designates a rectangle centered on Deal Island (GJQJ0207), running {{convert|6|nmi|km|0}} east–west and {{convert|8|nmi|km|0}} north–south. Designation GJPJ4103R5 means a circle around Point Lookout (GJPJ4103) with a radius of {{convert|5|nmi|km|0}}. Designation GJPJ3716H17 means a height of 17,000 feet over GJPJ3716.yrrth therh gherh efgtm
== See also ==
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