[aprssig] Vicinity plotting of stealth digipeaters

Randy Love rlove31 at gmail.com
Thu Dec 11 11:08:57 EST 2014

In a feeble, off the cuff, maybe-it-would-work first suggestion, how about
averaging the lat and lon of the stations digipeated by the stealth digi,
and have position ambiguity of 10 miles?

Theoretically, the digi would be somewhat central to those stations that
were digipeated by it, thus averaging the lat and long would place the digi
somewhere in the area outlined by the locations of the stations digi'd by

There are exceptions to this thought, of course, but better than nothing at


On Thu, Dec 11, 2014 at 10:05 AM, Andrew P. <andrewemt at hotmail.com> wrote:

>  Does anyone have any advice or opinion on vicinity plotting of stealth
> digipeaters? Or have I stepped into a brave new world here?
>  Andrew, KA2DDO
> -------- Original message --------
> From: "Andrew P." <andrewemt at hotmail.com>
> Date:12/05/2014 13:20 (GMT-05:00)
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Subject: [aprssig] Vicinity plotting of stealth digipeaters
> Greetings, all.
>  I've got a question about vicinity plotting (i.e., guessing where a
> station is based on its first digipeater's position when the station hasn't
> reported its position yet).
>  Is it reasonable to do this in reverse, i.e., guessing where a first
> digipeater is, based on the position report of the digipeated station?
> Because stealth (non-beaconing) digipeaters are common in my area, I have
> implemented a first draft of this in my YAAC program.
>  I assume this needs to be improved, perhaps using direction-finding
> tricks such as guessing the digipeater has to be within the PHG range
> circles of all stations it has first-digipeated.
>  But should I be doing this kind of approximation at all?
>  Just curious.
>  Andrew, KA2DDO
> (putting my asbestos shorts on now :-)
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