[amsat-bb] Tracking Friends at Dayton..

Robert Bruninga bruninga at usna.edu
Wed May 13 13:43:56 PDT 2009

This year you can use your DTMF HT to report where you are
hanging out at the Hamvention to about 120 feet just by sending
two digits for your XY coordinate.

Just print a small copy of the map on www.aprs.org/aprstt.html
for the XY grid to carry with you.  Everyone in the world
(including those at dayton) looking at an APRS display will be
able to find you.  See the live map here:

For example, the Bar at the corner of the arena is at
coordinates 65 and the AMSAT booth is near 32.  To send these xy
coordinates into APRS using DTMF, just tune to the APRStt
frequency 146.58 and hit the keys Bxy* then hit the key to send
your DTMF callsign from memory, and bingo...  Your transmission
is received by the APRStt engine centrally located (near grid
44) and converted to packet on the APRS channel for the world to

Using the same paper map above, if you have a TH-D7 or VX-8R you
can also report your position to 60 feet without a GPS by just
bumping the hundredths of a minute of lat/long to the aa/bb grid
located on the same map above.

LAT 3949.aa
LON 8415.bb 

Print the map from the www.aprs.org/aprstt.html web page.  It
also shows you how to program your DTMF callsign so you can save
it in your HT's DTMF memory.

See you on the map at Dayton!
Bob, Wb4APR

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