[aprssig] AVMAP-G6 Speaks APRS messages!

[Bob Bruninga]

And the AVMAP-G6 can SPEAK all APRS messages that way.  It uses a good
quality test-to-speech synthesizer!!!

> You then connect the AvMap G6 to the TT4 serial port,
> and the AvMap will send position data to the TT4 
> to be transmitted.  Also, the TT4 will send received 
> other stations as waypoints to be displayed on the AvMap.
> Also, you can use the AvMap G6 screen and QWERTY touch screen
> to send and receive APRS text messages.