This demonstration was designed by KI6TSF to illustrate how geolocation information can be combined with pictures sent over the air. Kids as well as grown-ups had a lot of fun watching it and had a lot of interesting questions. One kid said "Oh this is not your grandfather's ham radio anymore!". APRN was invented by WB4APR Bob Bruninga, the inventor of APRS. More information about APRN can be found at http://www.usna.edu/Users/aero/bruninga/aprntxt.html
APRN is a great way of adding useful metadata information to pictures taken from moving operators. From hot air balloons to parachute mobile to bicyclists, sending and receiving pictures annotated with geolocation information can increase the excitment by a great factor. A friendly repeater around the area will allow SSTV and APRS traffic to be transmitted on its input frequency. A typical SSTV picture in Robot 36 mode takes 36 seconds on the air, which is very reasonnable QSO time in ham speak.
APRN can be used on HF to provide receiving stations with the GPS location of the sending station. Since HF is less forgiving than VHF for data transmissions, it would be more appropriate to transmit the APRS packets at 300 baud instead of 1200 baud. A SSTV mode appropriate for HF would be Scottie DX.
APRN could be used via satellite too. Due to the limited number of ham radio operators doing APRN in any given area, this is a great way of reaching more people. Not all amateur radio satellites will allow SSTV and packet transmissions on their transponders. In the case of the ARISS station on the ISS, APRS is already allowed and supported since the station carries an APRS digipeater. With some coordinated effort, it should be possible to send APRN traffic via split frequencies (for both SSTV and APRS) and recombine them at the receiving end.
July 2010, KI6TSF