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- https://trac.org.tr/uploads/doc/9636770-aprs-i-gate.pdf
- https://picoballoon.ist/2019/02/10/raspberry-pi-ve-rtl-sdr-kullanarak-kolayca-aprs-igate-yapimi/
- https://qrv73.com/raspberry-pi-ve-rtl-sdr-ile-igate-yapimi/
- https://www.qsl.net/ta1dx/aprs/aprs.htm
- https://skyblg.wordpress.com/2017/11/15/igate-rtl-sdr-pi-direwolf/
- https://qsl.net/p/py5bk//hamraspsv/
- Search for GPS coordinates
- https://www.geoplaner.com/
- https://github.com/lora-aprs
- TNC Test CD
- http://aprs.qrz.ru/index.php
- http://aprs.bulinfo.eu/