[aprssig] Vicinity Plots on APRS
bruninga at usna.edu
Wed Jun 1 14:29:06 EDT 2011
> a few years ago my wife drove to Florida...
> Early in the trip the GPS became disconnected.
> FindU was therefore showing her off the West Coast of Africa.
> However, by looking at the Digi... I could look that
> station up and see where she was on her trip,
> down to at least the city/county level.
Actually, I think Steve finally added VICINITY to FINDU that will do that
automatically, but I have never been able to find any info about the
capability on his pages. Even search for "vicinity" on any of his pages
finds nothing. I think you add &vicinity=1 to the URL.
Yes, just tried it, and it finds the nearest digi, but the map display is
> Given the odds against a station actually being at 0 Lat/0 Long,
> should there be a rule to the effect that those positions
> will be treated as position-less and therefore plotted using
> the Vicinity protocol? Perhaps a user option?
I agree. That was in the fundamental concept of APRS. There is another
similar feature in APRSdos that used LAT/LONG of 40/40 (out in the ocean)
as a means of reporting position from a table. This way, one could just
enter a LAT of 4013 and that would mean you were at checkpoint 13, and then
that woiuld be associated ffom a lookup table for that checkpoint.
Something like that...
That made it easy to use D7's without fussing with GPS's for special events
but could still generally see where operators were.
> Or is that already covered in the spec?
Not allowed by the other authors on the SPEC committee who did not want to
be told how to plot things.
>From: Bob Bruninga <bruninga at usna.edu>
>> Just imagine if you lived in West Africa and ran this programe
>> how annoying it would be having all these stations just off the
>> coast at 0 Lat 0 Long coming and going .
>Yes, that was never intended to happen...
>> Why display a station anywhere on a map when it's a guess.
>Because the global APRS system is a big place. But knowing someone
>originated a packet via a given digi, nails down the stations position in
>the network (for communications purposes) 99.99999% from about 6 million to
Randy Allen, KA0AZS
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