Credits and thanks go to:

Tapio Sokura, OH2KKU
· for the stable & fast APRS packet parser module, Ham::APRS::FAP

Mikko Pikarinen, OH2MP (http://oh2mp.ham.fi/)
· for the polyline/overlay example

Laurent Haas, F6FVY
Jari Perkiömäki, OH6BG (http://www.voacap.com/qth.html)
· for the maidenhead & coordinates JS cursor code

Matti Aarnio, OH2MQK
· for the maidenhead to coordinates conversion and distance/direction calculation code

Bob Bruninga, WB4APR
· for APRS

Caio Chassot (http://www.alistapart.com/articles/popuplinks)
· for the pop-up browser window JS code

Stephen H. Smith, WA8LMF (http://wa8lmf.net/)
· for the up-to-date APRS symbol graphics

Justin McAllister, K5EM
· for the gaprs.net domain, and passing on the symbol icons

Geonames
· for a free geographical database (the city coordinates), licensed under a Creative Commons Attribution 3.0 License

Google
· for the map and API