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My station = WA7SKG in Dallas, OR
Digipeater = W7SRA about 20 miles SE of me, about 10 miles south of
Salem, OR
Digipeater = NICOLI about 90 miles NW of me near Westport,OR
Digipeater = BAMBAM about 130 miles NE of me near Goldendale, WA
(These digipeaters show up in their proper locations on )

The NICOLI and BAMBAM digipeaters routinely show up with gray icons with
red question marks in a small area about 2-3 miles radius of W7SRA
digipeater.

Michael WA7SKG


Andrew P. wrote on 1/5/20 6:30 PM:
> 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