Where is a map of the Internet backbone located on the World Wide Web?

In its most widely used form, APRS is transported over the AX.25 protocol using 1200 baud Bell 202 audio frequency-shift keying on frequencies located within the amateur 2-meter band - usually 144.390 MHz in North America, 145.175 MHz in Australia, 144.575 MHz in New Zealand, 144.930 MHz in Argentina, 145.570 in Brazil and 144.80 MHz throughout Europe. An extensive digital repeater, or "digipeater" network provides transport for APRS packets on these frequencies. Internet gateway stations (i-Gates) connect the on-air APRS network to the APRS Internet System (APRS-IS), which serves as a worldwide, high-bandwidth backbone for APRS data. Stations can tap into this stream directly, and a number of databases connected to the APRS-IS allow web-based access to the data as well as more advanced data mining capabilities. A number of low-earth orbiting satellites and the International Space Station are capable of relaying APRS data.