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<DIV><FONT face=Arial size=2>Playing with a tracker on the bench
here</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The first line is APRS</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The second line...well you get the
picture</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>VK4TEC-12>APRS,WIDE:
<<UI>>:=2734.45S/15306.22E'SATS
07<BR>RAW,27344572,S,153062245,E</FONT></DIV><FONT face=Arial size=2>
<DIV><BR>VK4TEC-12>APRS,WIDE: <<UI>>:=2734.45S/15306.22E'SATS
07<BR>RAW,27344572,S,153062245,E<BR></DIV>
<DIV>VK4TEC-12>APRS,WIDE: <<UI>>:=2734.45S/15306.22E'SATS
07<BR>RAW,27344572,S,153062245,E<BR></DIV>
<DIV>VK4TEC-12>APRS,WIDE: <<UI>>:=2734.45S/15306.22E'SATS
07<BR>RAW,27344572,S,153062245,E<BR></DIV>
<DIV>VK4TEC-12>APRS,WIDE: <<UI>>:=2734.45S/15306.22E'SATS
07<BR>RAW,27344573,S,153062245,E</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=wes@ai4px.com href="mailto:wes@ai4px.com">Wes Johnston, AI4PX</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aprssig@lists.tapr.org
href="mailto:aprssig@lists.tapr.org">TAPR APRS Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, May 11, 2008 1:31 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [aprssig] DAO quantified.</DIV>
<DIV><BR></DIV>
<DIV>I'm hoping this attachment goes through the list.</DIV>
<DIV> </DIV>
<DIV>The pic on the left is a screen shot from <A
href="http://aprs.fi">aprs.fi</A> , the right is <A
href="http://findu.com">findu.com</A> . I am setting up a tracker for a
club and am running it in the back of my car for a few days to see if I've got
it setup the way I want. Actually another local ham and I have been
getting a kick out of the fact that my speed can vary from when one tracker
transmits and the other transmits. We get a kick out of how the rear of
my car can be going faster or slower than the front and in a different
direction.</DIV>
<DIV> </DIV>
<DIV>The call of the tracker is k4scg-15 and it's running DAO on Scott
Miller's OpenTrak.</DIV>
<DIV>My mobile call is ai4px-9 and i'm running a d700.</DIV>
<DIV> </DIV>
<DIV>The D700 transmits with a 60' (18meters) ambiguity, DAO adds digits of
precision down to 2' (60cm). </DIV>
<DIV> </DIV>
<DIV>In the pic on the left, you can see the difference in location from the
DAO tracker vs my d700. k4scg-15 is exactly in the correct spot on the
north side of the street near the mailbox. ai4px-9 incorrectly appears
in the neighbor's driveway.</DIV>
<DIV> </DIV>
<DIV>Findu does not display the added precision, so k4scg-15 appears in the
same qth as my d700.</DIV>
<DIV> </DIV>
<DIV>What's great about this is that any aprs station can decode the position
to 18meters. Clients like <A href="http://aprs.fi">aprs.fi</A> and
xastir can decode the 60cm positions.</DIV>
<DIV> </DIV>
<DIV>By the way, this is not meant to make one web site appear better than the
other. It was a very convenient way to show the difference between mic-e
packets and DAO enabled packets. APRS.fi and findu just provided an easy
way to contrast the improved precision on the same photo.<BR clear=all><BR>--
<BR>Wes<BR>---<BR>Where there's silence, there is no Hope. </DIV>
<P>
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