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DECODE_APRS(1)		    General Commands Manual		DECODE_APRS(1)

NAME
       decode_aprs - Convert APRS raw data to human readable form.

SYNOPSIS
       decode_aprs [ text-file ]

	      text-file	 should	contain	AX.25 packets in the standard monitor-
	      ing format.  If no file specified, data will be read from	stdin.

DESCRIPTION
       decode_aprs is useful for understanding sometimes obscure APRS  packets
       and finding errors.

OPTIONS
       None.

EXAMPLES
       You see something like this show	up on your screen:

	      M0XER-3>APRS63,WIDE2-1:!/4\;u/)K$O J]YD/A=041216|h`RY(1>q!(|

       What  does  it  mean?   If you haven't spent a lot of time studying the
       APRS protocol specification, most of  it	 probably  looks  like	random
       noise.  Pipe it into decode_aprs	to find	out.

	      echo			   'M0XER-3>APRS63,WIDE2-1:!/4\;u/)K$O
	      J]YD/A=041216|h`RY(1>q!(|' | decode_aprs

       http://www.findu.com/cgi-bin/errors.cgi has a  never-ending  collection
       of  packets  with  errors.   Sometimes it's  not	 obvious what is wrong
       with them.  Dire	Wolf will usually tell you what	is wrong.  First, cut-
       n-paste the bad packets into a text file.  Here a couple	examples:

	      n2cma>APRS,TCPIP*,qAC,SEV-
	      ENTH:@212127z43.2333n/77.1w_338/002g001t025P000h65b10208.wview_5_19_0

	      K0YTH-10>APNU3B,NULL,qAR,K0DMF-10:!4601.5NS09255.52W#PHG6360/W2,MNn
	      444.575

       If  you	simply	fed  this  into	decode_aprs, it	would  complain	 about
       the  lower  case	 in qA-something, added	by the IGate, in the via path.
       We can take it out with something like this:

	      cat findu-errors.txt | sed -e 's/,qA.*:/:/' | decode_aprs

       In the first case, we get,

	      Address has lower	case letters. "n2cma" must be all upper	case.

       After changing the source address to upper case,	there  are  other  is-
       sues.  Identifying them is left as an exercise for the reader.

       And in the second example,

	      Invalid character	in latitude.  Found 'N'	when expecting 0-9 for
	      hundredths of minutes.
	      Invalid character	in longitude.  Found '9' when expecting	0 or 1
	      for hundreds of degrees.

SEE ALSO
       More   detailed	 information   is   in	 the  pdf  files  in  /usr/lo-
       cal/share/doc/direwolf, or possibly /usr/share/doc/direwolf,  depending
       on installation location.

       Applications  in	 this package: aclients, atest,	decode_aprs, direwolf,
       gen_packets, ll2utm, log2gpx, text2tt, tt2text, utm2ll

								DECODE_APRS(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO

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