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README.SYM
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1993-09-16
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APRS DISPLAY SYMBOLS
As of version 1.16, APRS supports 28 or more different display symbols
for differentiating objects on the map. The obvious advantages of such
symbols is to show at a glance what type of packet stations are represented
by the various callsigns shown on the maps. Another improvement is the
addition of two large symbols, one for thunderstorms and one for hurricanes
that cover a much larger geographical area. Although these symbols are still
placed on the map at a very precise location, their large symbol areas are
much more representative of the very large objects that they represent! The
maps are therefore much more realistic when used in the SKYWARN application.
To make these symbols backward compatible with earlier versions of APRS,
the delimiter after the Longitude in the standard APRS POSITION report was
changed from the fixed (/) character to a variable SPECIAL character to
represent the different symbols available. Printable ASCII punctuation
characters are mostly used to represent each of the display symbols.
Although these special characters are automatically inserted into the APRS
position reports, they are specified here for manual TNC stations. Remember
that any TNC can still show up on APRS maps and displays as long as a
properly formatted APRS position report is placed in the TNC BText. By
placing one of these special characters as the delimiter after the LONGITUDE
field, a station with only a dumb terminal can control his appearance on
other APRS displays. For more information on manually formating APRS reports
using only a dumb terminal, see the README.DUM file. The following table
describes the symbols available and the special characters used to represent
them. Notice that there are several generic shapes without designated
descriptions, so that users can tailor their symbology to the particular APRS
net application. If you have any suggestions for other symbols, please send
them in...
SYMBOL TYPE SPECIAL CHARACTER COMMENTS
------------ ----------------- -----------------------------------
AIRPLANES ' Also for all -7 SSID's (heaven)
BBS [
CIRCLE o Default for NMEA reporting stations
DIGIpeaters #
EMERGENCY !
FIXED station : A club station, etc
GATEWAY &
HUMP ) Generic shape
TCPIP }
Jay (J) , Generic shape
Kross + More like a RED CROSS
Location . generic
MAILBOX ] PBBS's etc
NODE's x
OBJECT / Default symbol
PORTABLE ; Looks like a tent
QTH -
RAIL = trains, etc
SHIP ~ Also for all -8 SSID's (pieces of 8)
TRIANGLE \ Generic shape
U U U ( Generic shape
VEHICLE > Also for all -9 SSID's (engn, engn, #9)
WEATHER _ (I used underline for ground conditions)
DX Cluster %
Y Y Generic shape
Z z Generic shape
THUNDERSTORM ` A large raincloud shape
HURRICANE @ A large Swirl
SNOWFLAKE *
(none) G No symbol for 4 digit Grid Square reports
(none) ? No symbol for 6 digit Grid Square reports
(this preserves the ambiguity of G.S rpts)
Note that Weather stations will always show up as blue. This overides all
other APRS colors. Weather stations will also not be dead reckoned since
their course and speed indicates wind conditions and not station meovement.