A GPS unit, or Global Positioning System unit, is a device that determines your exact location on Earth using signals from satellites. It can provide real-time navigation, helping users find directions, track routes, and estimate travel times. GPS units are commonly used in cars, smartphones, and handheld devices for outdoor activities. These devices work by triangulating signals from at least four satellites orbiting the Earth. The GPS unit calculates its position based on the time it takes for the signals to reach it. This technology is widely used in various fields, including aviation, maritime navigation, and geocaching.