Veteran NASA astronaut Leroy Chiao will replace William S.
McArthur, Jr., as the commander of Expedition 9, the next mission aboard the International Space Station.

The change in crew assignment is a result of a temporary medical issue related to McArthur's qualification for this long duration flight.

ISS Packet Status - Quick Tips:

Frequency
Packet Mail

Unproto, Round-Table and APRS:
The "Round Table" mode is a keyboard to keyboard form of communication.
Round table will allow you to type short messages, which will be relayed (a.k.a. Digitally Repeated or Digi for short) through the APRS and retransmitted over a distance in excess of 1000 miles. Round Table mode allows many people to participate in a Round Table.....