[aprssig] FW: APRS Symbol for Fox hunting?

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Fri Feb 10 10:17:53 CST 2017


I've not actually tested it, but APRSISCE/32 should gracefully ignore 
any DF symbol that contains improperly formatted data.  The station 
should display with the symbol, but without any of the extra visual 
features.

And this is a timely message!  I'm going to be at the Orlando Hamcation 
tomorrow and they have a Foxhunt scheduled at 4:00pm. I'm not sure if 
I'll participate in the actual hunt (having never done one before), but 
maybe I'll see if the participants can give me a copy of their reports 
after the fox is found and I can post the DF objects showing their 
discoveries.  I could even post the different teams with different 
!shriek! qualifiers so that APRSISCE/32 users can see them individually 
using the View / Shrieks display filter.

Probably won't get any objects on the map until Sunday sometime, but it 
would be an interesting exercise (and possible debugging aid for 
APRSISCE/32's implementation of DF support).  And who knows, maybe I'll 
hook the display into my upcoming APRSISMO Android client sooner than later!

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32


On 2/10/2017 10:50 AM, Robert Bruninga wrote:
>
> APRS has a symbol for a DF report. “/\” and it is listed in the symbol 
> tables as a TRIANGLE (DF report).
>
> Then the APRS spec defines all kinds of data that can be included in 
> that report includgin Bearing, Quality, Hits, range signal strength, 
> in addition to the objects course and speed, etc
>
> Someone asked for a DF or Foxhunting symbol.  I suggested to use the 
> DF symbol… the question is, what will clients do with an object using 
> a DF symbol that does not then contain all the DF report parameters…  
> Does it try to make them into gyberish, does it report a DF error?
>
> Anyway, just thought I wouild not the possible unknown-behavior when a 
> DF symbol is used and there is no data.
>
> I don’t see a need to do a FOX symbol, since no one should see that 
> until the end.  Just use an X or something with the name FOX.
>
> I thought that DFing would be the #2 application of APRS since it 
> could instantly triangulate and locate jammers and hidden transmitters 
> as a collective multi-user process.  But people seem to not use the 
> event-object plotting of DF data much at all.
>
> Here is the APRS DF-ing page:
>
> http://aprs.org/dfing.html
>
> And the original APRSdos text file on DFing:
>
> http://aprs.org/APRS-docs/DF.TXT
>
> Bob, WB4APR
>
>
>
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