Bell 202 lives on as well: https://www.windytan.com/2014/02/mystery-signal-from-helicopter.html https://www.windytan.com/2014/02/mystery-signal-from-helicop...

Bell 202 lives on as well: https://www.windytan.com/2014/02/mystery-signal-from-helicopter.html https://www.windytan.com/2014/02/mystery-signal-from-helicop... In this case, continuous GPS coordinates are sent on one audio channel while the other channel is voice.