ISS Detector, by Derk Vrijdag, helps users locate and observe the International Space Station and visible satellites with timed guidance. The app calculates precise pass times, directions, and elevations, presents radar-style guidance and a 3D sky dome, and combines real-time tracking with local weather to plan sightings. It includes customizable notifications, Apple Watch alerts, Starlink and Hubble tracking, and an Amateur Radio extension, suited to space enthusiasts, families, and amateur radio operators.

What the app does for observational learning

ISS Detector turns orbital data into scheduled learning opportunities by giving clear pass predictions with exact times, compass bearings, and elevation angles for the ISS and other visible satellites. Those outputs let learners schedule short outdoor observation sessions tied to real celestial events, and the app checks local weather forecasts to mark likely clear-sky passes before heading outside.

How it supports beginners in finding satellites

Visual guidance reduces field confusion with a radar-style display and a 3D sky dome that map an object's path across the sky. Timed alarms notify observers ahead of a pass so learners can assemble and look up at the right moment, and cached orbital data lets the app continue guiding for a limited period without an active connection once data is downloaded.

Who can use it in classrooms or hobby projects

Flexible audience fit from families to radio clubs, since the app targets space enthusiasts and amateur radio operators as well as casual observers. The Amateur Radio extension supplies Doppler-shift calculations and transmitter frequencies, and support for rotator control via rotctld helps automate antenna pointing for classroom demonstrations or HAM projects that combine observation with hands-on radio work.

Where it differs from general stargazing tools

Specialized telemetry and object tracking set it apart by including tracking for Starlink trains, Hubble, and bright rocket bodies alongside satellite pass predictions. The app runs on iPhone and iPad (requires iOS 12.0 or later) and gives a cross-device experience that caters to both casual sighting sessions and technically focused learning activities uncommon in general-purpose sky apps.

Who should adopt it and how to get the most from a session

The app is a practical option for educators and hobbyists who want to schedule real-world observation sessions tied to orbital events; it supports both simple group stargazing and technical radio projects. Note that some users reported mixed feedback on recent navigation changes, so plan a short demonstration for students before independent use. A brief starter activity helps learners connect the timing and sighting experience to orbital mechanics.