UISS software is
specialy designed to operate the ISS with APRS/PACKET.
With this software its easy to transmit with the buttons.

Download
here the UISS 5.1 packet software
UISS website: http://users.belgacom.net/hamradio/

With the TX APRS message window you can sent a message to ALL stations!
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With the TX APRS Message window you can send e-mail to a other station (via igate station).