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[aprssig] Vicinity tracking to Dayton

Robert Bruninga bruninga at usna.edu
Thu May 15 14:51:41 UTC 2008


If someone does not have a working GPS, they can still be
approximately tracked to Dayton.

As long as they are transmitting some packet periodically, then
you can use vicinity tracking to see at least what digi they are
near.  On FINDU, there is a great vicinity tracking feature.
Just add "&vicinity=1" to the end of the normal FINDU.COM URL
and it will plot the location of the digi that first heard the
packet.  Here is an example:

http://www.findu.com/cgi-bin/find.cgi?call=we4apr-9&vicinity=1

That should plot the nearest digi that heard my last packet.

Using this feature, you can track things over large distances
without having to power the GPS.  Just flea power to a tiny PIC
and transmitting a BEACON once every 30 minutes could last a
year on a set of AA cells.

Good luck
Bob, WB4aPR





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