To the Nathans and anybody else interested: here&#39;s a link the the Arduino APRS shield I was talking about - the guy used it in a balloon project.<div><br></div><div><meta charset="utf-8"><span class="Apple-style-span" style="border-collapse: collapse; font-family: arial, sans-serif; font-size: 13px; "><a href="http://hackaday.com/2011/04/20/trackuino-%E2%80%93-an-open-source-arduino-aprs-tracker/" target="_blank" style="color: rgb(0, 84, 136); ">http://hackaday.com/2011/04/20/trackuino-%E2%80%93-an-open-source-arduino-aprs-tracker/</a></span></div>
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