The Amateur Radio on the International Space Station (ARISS) cross-band repeater will be available for ARRL Field Day, June 26 - 27. Contacts will count toward Field Day bonus points as satellite contacts and Field Day contacts. Field Day rules limit stations to one contact on any single-channel FM satellite. Note that contacts made during Field Day by ISS crew would only count for contact credit, but not for satellite bonus points. ISS cross-band repeater contacts are also valid AMSAT Field Day satellite contacts.
The ARISS cross-band repeater uplink is 145.990 MHz (67 Hz tone), with a downlink of 437.800 MHz. ARISS suggests that those unfamiliar with the ISS repeater may want to practice with it prior to Field Day.
ARISS had planned to switch modes to the Automatic Packet Reporting System (APRS) during the second week of June, but this won't happen until after the first ARISS school contact following ARRL Field Day. The ARISS ham station will be off-air during spacewalks on June 16 and June 20.
Source: arrl.org and ariss.org