Which device is essential for geocaching to send and receive signals with satellites?

The device essential for geocaching to send and receive signals with satellites is the GPS (Global Positioning System). Geocaching relies on satellite navigation to determine precise locations on Earth. A GPS device receives signals from satellites, allowing it to calculate the exact coordinates of the user's location and help them navigate to hidden caches.

Using GPS technology, geocachers can pinpoint their coordinates, track their movements, and find cache locations marked by latitude and longitude. This functionality is fundamental to geocaching, as it is all about finding hidden treasures using geographic coordinates provided on various geocaching platforms.

While smartphones and smartwatches often come equipped with GPS functionality and can be used for geocaching, the core technology that enables this spatial orientation remains the GPS system itself. Digital cameras, although useful for documenting finds, do not play a role in receiving satellite signals for navigation. Thus, the GPS device stands out as the fundamental technology necessary for the geocaching experience.