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APRS Internet System

The APRS-IS is an Internet-based backbone network which interconnects APRS radio networks. The core network consists of three first-tier servers and numerous second-tier servers, providing a unified worldwide APRS stream to connected clients.

IGates connect the APRS-IS to radio networks, and typically consist of an Internet-connected PC, radio, and TNC.

(need discussion of ports and filtering)

APRS-IS also is used as a data source for databases like findu.

APRS-IS is used to transport data that did not originate on RF and should not be gated to RF, some CWOP weather system reports for example.

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