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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">To me, FIRST digi is the most important. It allows NATIONAL tracking for weeks with nothing but a tracker an 6 AA cells (no GPS).</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Here’s how:</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Use any timer/pic porocessor/tracker and simply transmit a short STATUS text once every 10 minutes.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://APRS.FI">APRS.FI</a> and/or <a href="http://FINDU.COM">FINDU.COM</a> plot the location of this first heard-no-posit-beacon and plots it as a “VICININTY” plot showing the nearest digipeater that heard it. FINDU does this now, I am not sure about <a href="http://APRS.FI">APRS.FI</a>.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">This gives you a plot anywhere in the country where that tracker has been (to the nearest 10 miles or so). And at one packet every 10 minutes at 5 Watt output, then the average power is 0.01W or at 7 volts (6 cells) at 1.4 mA which should last 2000 hours on a AA alkaline cell or about 3 months.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">No, it is not precise tracking, but for tracking something all over the country with no access to anything but 6 AA cells, it is a great technique.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">ALSO of course, knowing the first digi while messaging is useful for assuring that digi gets a copy of any messages to that station.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Bob, WB4APR.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a> [mailto:<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>] <b>On Behalf Of </b>Andrew P.<br><b>Sent:</b> Tuesday, January 20, 2015 3:26 PM<br><b>To:</b> TAPR APRS Mailing List<br><b>Subject:</b> [aprssig] First digi versus last digi?</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">Greetings, all.</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">I'm looking at adding some more path analysis features to my APRS program, and was wondering what the consensus was regarding plotting path from original sender to first digipeater/Igate versus path from last digi/Igate to receiver. Which has more value to the user? </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">I ask this because my original implementation supported last digi, but this never seemed to be useful. And now I'm adding functionality to identify and guesstimate-locate stealth first digis. </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Is there any need to keep last digi identification, filtering, etc.?</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Just wondering how people woukd feel about that.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Andrew Pavlin, KA2DDO </p></div><div><p class="MsoNormal">author of YAAC </p></div></div></body></html>