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The Global Positioning System can be used to give every terminal a geographic address for multicasting to and from recipients within specified geographical areas. 86 April 1999/Vol. 42, No. 4 COMMUNICATIONS OF THE ACMGPS cards will soon be included in cars manufactured in the U.S. and Europe and possibly in every other form of mobile computer as well. A user’s location will be another piece of information—as common as the date is today—getting input from the GPS when outdoors and from other location-providing devices when indoors. The availability of location information will have a broad effect on both application-level and network-level software. Possible new services and functions include geographic messaging, advertising, and resource discovery. Geographic messaging is the ability to send a message selectively to specific geographic subareas defined by latitude and longitude—for example, sending an emergency message to everyone in a specific area, such as a building, train station, or highway. The ability to send a message to a distinct geographical area would
Imieliński et al. (Thu,) studied this question.