Helping amateur radio operators connect with the International Space Station
ISS.guru was created specifically for amateur radio operators who want to communicate through the International Space Station's amateur radio repeater system.
The ISS carries amateur radio equipment as part of the ARISS (Amateur Radio on the International Space Station) program. This allows ham radio operators on Earth to make contact with astronauts aboard the station and communicate with other operators via the ISS repeater.
Timing is everything in satellite communications. You need to know exactly when the ISS will be above your horizon, at what elevation angle, and in which direction to point your antenna. ISS.guru provides precise pass predictions to help you plan your contacts and maximize your chances of successful communication.
Note: Frequencies may change. Always check current ARISS status before operating.
Our pass predictions calculate when the ISS will be visible from your location, providing essential information for successful amateur radio contacts:
When the ISS appears above your horizon
Highest point in the sky - best signal strength
When the ISS disappears below horizon
Higher elevation passes (above 20°) typically provide better signal quality and longer communication windows. The ISS is only audible when it's above your radio horizon, typically lasting 2-8 minutes per pass.
Use our location finder or browse cities to get pass predictions for your area.
Review upcoming passes and choose ones with good elevation angles. Learn how to use pass data.
Set up your equipment and try to make contact during the predicted pass times. 73!