Using the Signalscope

The Signalscope is a tool used to detect signals around the solar system, which is used in many points throughout the story. It gives the location of where certain things are, appearing as "Unknown" until you've gotten close to the signal. It can also function as a telescope. When you point at a signal with the Signalscope, a unique sound will play depending on the frequency or the traveler. At the start of the game, the Signalscope only has one frequency, Outer Wilds Ventures, used to show the locations of the other Hearthian travelers.

When you get close to a signal still marked as "Unknown", a notification will pop up letting you know there is an unidentified signal nearby. Once you've found it, the signal will be marked with it's name, and in some cases it may unlock a new frequency. There are four of these frequencies to discover: Quantum Fluctuations, Distress Beacon, Deep Space Radio and Hide and Seek, making for five in total when including the one you have unlocked from the start. The Hide and Seek frequency, unlike the others, does not stay unlocked through loops.

Below is a table showing every signal in the game.