the space station is visible, at a minimum angle of elevation of 10° at the Earth's surface, from its associated earth stations or service areas . . . [and] within which the space station could provide the required service to its associated earth stations or service areas. . . ." Further, the arcs are to be "indicated by the geographical longitude of 64 the extremes of these arcs on the geostationary satellite orbit." Revised Article 9A of the 1971 Regulations also identified the need for member States to engage in coordination respecting proposed frequency assignments. The Article made specific reference to the use of the frequency spectrum above 1 GHz. Pursuant to Section II., "Co-ordinating Procedures to be applied in appropriate Cases" before a member State gives notice to the Board or brings into use any frequency assignment to an earth station, whether for transmitting or receiving, in a particular band "allocated with equal rights to space and terrestrial radiocommunication services in the frequency spectrum above 1 GHz, it shall effect co-ordination of the assignment with any other administration whose territory lies wholly or partly within the co-ordination area of the planned earth station." Aside from the issue of priority and notice, there is also the companion problem of registered assignments that are not in active use. This has been referred to as "deadwood." If first registration with the IFRB establishes a preferred right, if not a permanent priority, to the use of a frequency, then the non-use could be considered to be a matter t. , Ibid. T. . , Ibid. Ibid., Paragraph 639AN, p. 1689.
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