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Hmmm... vicinity plotting can also work in the opposite direction to guesstimate the position of "stealth" digipeaters (those that do not transmit position reports of their own, and only meet their legal station identification regulations by UITRACE-inserting their callsign into digipeat paths). When a regular station's position report is digipeated by a "stealth" digipeater, YAAC attempts to approximate the position of the digipeater as being in the centroid of all the stations it has been heard to digipeat.
How do you know these digipeater positions are incorrect? How are you checking this?
Please provide some callsigns of the participating stations so others can help you interpret what is going on.
Andrew, KA2DDO
author of YAAC
________________________________________
From: [email protected] <[email protected]> on behalf of Michael WA7SKG <wa7skg@...>
Sent: Saturday, January 4, 2020 11:51 PM
To: [email protected]
Subject: Re: [yaac-users] Strange Position Reports
Still confused. The two items I see most are digipeaters. They show up
on my map near (varying in about a five mile radius) a local digi, but
one is actually 90 miles away and the other is 130 miles away with
significant terrain between them and the local digi. They are persistent
in that they move around a little bit, but are shown for days at a time
in the same area. I do have "vicinity plotting" turned off, yet they
still show up. They never show up in their actual locations.
I only have RF items on my map. Nothing from the Internet is displayed.
Just another of those APRS mysteries I guess.
Michael WA7SKG
Andrew P. wrote on 1/4/20 6:47 PM:

The question mark icon is for stations with unknown positions. A station
that sends a status message, telemetry, or positionless weather report
first (as far as your station newly listening is concerned) means that
YAAC doesn't know where to plot it or what its symbol is. So YAAC
guesses the station's location by assuming it's near its first
digipeater (assuming the digipeater's position report has been heard).
This feature is called "vicinity plotting".

Once YAAC hears an actual position report with an APRS symbol code from
the station, it will change the icon and move it to the correct location
on the map.

While the station's actual position is not known, and either it wasn't
digipeated and heard by an I-Gate whose position isn't known, or
digipeated by a digipeater whose position isn't known, the position
remains at latitude/longitude (0,0). The button on the map toolbar with
a big 0 on it will jump the map to that location.

Note that, if you don't like it, you can turn vicinity plotting off in
the expert-mode configuration dialog.

Hope this helps.

Andrew, KA2DDO
author of YAAC

-------- Original message --------
From: Michael WA7SKG <wa7skg@...>
Date: 1/4/20 15:36 (GMT-05:00)
To: [email protected]
Subject: [yaac-users] Strange Position Reports

I see periodic objects show up with the icon of a gray circle with a red
question mark. They are many miles from their actual location. Clicking
on the icon gives me a box of either seemingly garbage characters or
just a blank in the comments field. Many of these are fixed sites, so I
know the location is not correct. Some are mobile, but when I talk to
them later, they were never in the area.

What's up with that?

Michael WA7SKG