[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
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:
> And the original APRSdos text file on DFing:
> Bob, WB4APR
> aprssig mailing list
> aprssig at tapr.org
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