[aprssig] WIDE settings

Stephen H. Smith wa8lmf2 at aol.com
Mon Sep 10 12:53:06 CDT 2007

Ken H> wrote:
> When looking at an APRS map, sometimes I see a solid green star - that
> is a "fill in digi" and the green star with the yellow "D" is
> considered a "high digi"???

What software are you using to display the symbols.?   

There are TWO different symbols used to denote digipeaters on APRS 
maps.  The original symbol from the primary APRS symbol set was a green 
star with the fixed letter "D" inscribed. This was used in the past for 
ALL digipeaters.  

More recently the solid green star with no letter in it from the 
secondary APRS symbol set has come into wide use.  This is SUPPOSED to 
be overlaid with a single alphanumeric character to indicate the digi's 
capability.  For example a number "1" overlaid to denote a WIDE1-1 
fill-in,  a number "2" to denote a high-level WIDE2-2, a letter "N" for 
a generic WIDEn-N digi, a letter "S" for a path-reforming single-hop 
digi, etc.   

This text character is encoded separately from the background symbol in 
the APRS packet, and is combined with ("overlaid") on the background 
star by the receiving station.  The problem is that many APRS programs 
do not properly render these composite symbols. They show the background 
symbol (the solid green star),  but DO NOT display the overlay character 
at all.  

Details on the APRS symbols, including overlays, are here:


"APRS 101"  Explanation of APRS Path Selection & Digipeating


Stephen H. Smith    wa8lmf (at) aol.com
EchoLink Node:      14400    [Think bottom of the 2M band]
Home Page:          http://wa8lmf.com  --OR--   http://wa8lmf.net

NEW!   World Digipeater Map

JavAPRS Filter Port 14580 Guide

"APRS 101"  Explanation of APRS Path Selection & Digipeating

Updated "Rev H" APRS            http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:

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